Posted: 12/11/2024 7:43:34 PM EDT
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I've found a cheap used P320 I'm thinking of buying. All the info I find is touting its "modularity" and there seem to be endless accessories and configurations I've stuck with Glocks for a long time, because of the low price and ease of use and aftermarket support, but I kinda just want to try something else now. Can someone give me a concise explanation of the platform? I'm intrigued by the idea of swapping 'modules' instead of having to buy more guns. |
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Everything is swapable on the p320. Your fire control group is the serialized part and everything else is infinity customizable. Attached File Here is the one I built from just the fcu Attached File Attached File |
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Pick a slide and a grip module. There’s full length barrels/uppers, compact 3.9” barrels/uppers and subcompact or “xcarry” 3.6” barrels and slides. Pitfalls: Mags not as interchangeable as glocks. Slamming a 17 rounder into a compact can overrun the mag catch and damage the ejector which is integral to the FCU stamping. Non upgraded slides won’t work with upgraded FCUs. Optics cuts have evolved. Check the FCD website for an explanation on their p320 optics plates section. Overall it’s pretty cool if you want a full size duty/range setup and a conceal carry setup. Watch the sigmechanics vids on YouTube if you want to see how the FCU works. |
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Early this year, I picked up a used P320 X-VTAC that already had an optic on it. I was not all that happy with the way it looked, so I decided to change it around a little bit. Before: Attached File After: Attached File The really nice thing about the P320 and the P365 series pistols is that they are very versatile when it comes to configuration. There is a multitude of options are available to suit most anyone's need/want. |
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As noted above, the removable FCU is the firearm. Not the slide. Not the grip module. So, for example, this 15rd P320 Compact and 12rd P320 Subcompact that I purchased not long after they were first introduced...  ...are now 17rd and 15rd Xcarry style P320s with optics. Same firearms as far as the government is concerned. Same FCUs, and hence, same serial numbers.  |
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Also, I believe part of the confusion Glock folks have with the P320 is that a Glock model (e.g., G19) implies a certain slide length and grip length. The general P320 model name does not. It's the name of the modular platform, which can be configured with a wide range of slide styles/lengths and grip module styles/lengths/thicknesses. The first P320s came in four slide/grip combinations, with 4 calibers (9mm, 40s&w, 357sig, 45acp) available in each size: Subcompact - short slide and grip length, like a G26, G27, G39, ... Compact - medium slide and grip length - like a G19, G23, ... Carry - medium slide and long grip length, like a 19x, ...and ? Full - long slide and grip length, like a G17, G22, ... So initially, the P320 model name without the subtype was actually referring to 16 different models, which covered a large portion of available Glock models, and some slid/grip length combinations and calibers they did not. For example, the 19x showed up long after Sig had the Carry model with long (full size) grip and shorter slide. And I believe those all shipped with medium thickness grip modules. They also offered small and large thickness grip modules. Sig has since moved on and stopped selling a subcompact model (because the P365 ate that market) and models in 357sig and 45acp, but they added a 10mm option. They also now offer models with a manual safety. Really, it's hard to track their models now because they introduce new options fairly regularly, but they are all built around the same P320 FCU design that works with pretty much any P320 grip module or slide (exception for 45acp). And Sig and third parties sell a wide range of aftermarket options for both. You can purchase weighted grip modules, tungsten infused grips modules, all aluminum grip modules, grip modules with an embedded laser, and more. The options for slides are as varied. The FCU is also customizable to some extent, with replacement trigger bars and bows. The potential combinations are seemingly endless, and you can spend as much or as little as you like. As shown above, I've made significant changes to two of mine, but I have a another first gen model that is bone stock. And it still works just fine.  BTW, you might hear the term "upgraded". Sig had a rolling design change early on to address the drop safe issue, and they offered folks who had the prior revision (like me) a free service to upgrade their pistol to the new design (which I did). There were a range of changes made in that upgrade, and it was well worth taking the time to send it in IMO. Since you said you are looking at a used P320, it's worth looking into whether or not it is an older model with the original design the owner didn't have Sig upgrade, but I suspect those represent a very small percentage of P320s in the wild now. That design change was quite some time ago. |
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I have three P320 FCUs (two 9mm/40 and one 45ACP), plus I have a 9mm P250. I have eleven different P320 slides of various lengths, subcompact, compact, full size and X-Five. About half have red dots and half are irons only. Three calibers: 9mm, 40S&W, and 45ACP (the latter only works with the 45 FCU, but all the others work with all three P320 FCUs). A few are configured and zeroed for shooting with a suppressor. I have six Wilson Combat grip modules and two Brouwer Grip Modules as well as a Sig X-ten grip module for 45ACP. I never use the standard Sig grip modules. I can use the P320 grip modules and the P320 mags with my P250 as well. Barrels are also interchangeable. So depending on what I want to shoot a particular day, I can throw it together and go shooting. I can assemble three different P320s and the P250 at any given time. Swapping calibers and grip modules is very easy. I can do it in less than a minute. Imagine if you could take an AR15 and swap uppers of three different calibers, from SBR to carbine to rifle lengths, plus imagine you could easily push pins to swap from a fixed stock to a carbine stock, all this with only one serial numbered lower. The P320 is kind of like that but for a pistol (and you can even put your P320 FCU into an SBR chassis like a Flux Raider). |
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My wife never understood why I got excited about new parts for my guns. Finally I explained that these are my Barbie Dolls. When I get an FDE handguard for my AK to match the FDE stock I already had, I was completing the outfit like getting a matching suit for a doll. Not sure if she approved of the weak metaphor, but it did make sense. The AR-15 platform is very well suited for the Barbie Doll approach. The parts interchange and you can dress one up however you like. Gunsmithing is pretty straight forward. You can make something that is really unique if you want. You can make something as accurate as your needs and or finances permit. Or just throw something together that works mostly that needn't cost much. It can be made elegant. Whatever you want Barbie to look like, there are accessories out there to do it. It seems to me, the P320 platform is trying to be that. Sig really wants to make a platform that you can doll up however much or as little as you like. You can get an FCU through your FFL and go to town with catalog or even aftermarket parts and they just snap together without any tools. It's not quite Lego easy, but pretty close. They make very basic guns that are as cheap as Glocks with very basic looks. You can find them for $400 new and Police trade in even cheaper when times are good. Want a competition rig? There's a series that weighs as much as a steel framed 1911 that can be had for under $1k. They have fancy looking rigs that cost more than $1.5k direct form the factory, and even a custom shop. You want a metal frame with the same innards as a plastic one, you can get it. You want upgraded innards with short light trigger pulls, you can get that, too, and it's not something that a gunsmith has to meticulously hand fit. In practice, it feels like Glock and their many clones are ahead in this game. That platform isn't designed around modularity, but Glock just has so much more market share. Old Gaston did a lot of things really well, thought everything through, and made a product that is aging better than anyone could have reasonably expected it to. The Glock magazines really are awesome and don't cost a fortune. Sig mags, not so much. Loading them without a Maglula takes some will power. There was never any "Perfection" in the development of the P250 or P320, but there has been a lot that has gone wrong. The P250 had magazine redesigns that make compatibility kind of complicated. The P320 had some parts redesigned beyond the just the well known rework involved with the early one not being drop safe. The grip modules had to start including take down levers to be installed in the FCU's because of them needing a redesign. But none of that matters if you are just getting in the P320 game now. Sure, some people might still get Glock leg from P320's when there's a negligent discharge of one of these striker fired handguns that doesn't wear a manual safety. Lighten the trigger and it doesn't take much shirt in the trigger guard for that thing to cook off a round. That's true of any handgun. But the internet has a lot of fun at the expense of the P320 due to those past design issues. Not saying the scorn isn't well deserved, only that it shouldn't keep you from seeing if it suits you. Even if it doesn't come with one, you can always add a manual safety. It's modular. If you want something for carry, the P365 series has a lot to offer. It has the same modularity architecture without the all the bad press. Magazine cost just as much, and both are hard to load. Personally, I prefer the classic P Series (P226, p229, ect) to the P320 or P365. I prefer the way the P320's shoot to anything Glock has done or their clones, but everyone is welcome to their own opinions. If you want to try out another brand of doll, go for it. You might like it. Or maybe you will just end up with some dolls and a box full of doll clothes you don't really enjoy playing with. Seems I have. |
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Quoted: I have three P320 FCUs (two 9mm/40 and one 45ACP), plus I have a 9mm P250. I have eleven different P320 slides of various lengths, subcompact, compact, full size and X-Five. About half have red dots and half are irons only. Three calibers: 9mm, 40S&W, and 45ACP (the latter only works with the 45 FCU, but all the others work with all three P320 FCUs). A few are configured and zeroed for shooting with a suppressor. I have six Wilson Combat grip modules and two Brouwer Grip Modules as well as a Sig X-ten grip module for 45ACP. I never use the standard Sig grip modules. I can use the P320 grip modules and the P320 mags with my P250 as well. Barrels are also interchangeable. So depending on what I want to shoot a particular day, I can throw it together and go shooting. I can assemble three different P320s and the P250 at any given time. Swapping calibers and grip modules is very easy. I can do it in less than a minute. Imagine if you could take an AR15 and swap uppers of three different calibers, from SBR to carbine to rifle lengths, plus imagine you could easily push pins to swap from a fixed stock to a carbine stock, all this with only one serial numbered lower. The P320 is kind of like that but for a pistol (and you can even put your P320 FCU into an SBR chassis like a Flux Raider). I do that with my registered lower. The comparison is a good one. Now I want a P320 too. |
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I sometimes call AR's the ultimate man's tinker toy. Don't like it, change it with endless combinations. The 320 is that in pistol form as others have mentioned. This is one of mine. I won the original gun in a shoot at Sig Sauer back in 2019. I'm pretty attached to the original FCU but it has moved around so many times it's not funny. Started as a 320 Carry (17rds, 3.9" barrel). For a while it ran with a subcompact 3.6 barrel and 15rd grip module. Then it was back to a 3.9" barrel but a Wilson Combat 17rd grip, w/ weights and a Gray Guns comp trigger. Then I changed slides to run then Rome1 Pro optic. Then it was a Romeo 2 optic with an AXG (aluminum) grip. Currently it has an M18 PRO top with a Romeo M17 optic and a Herrington Arms comp on the AXG grip. And of course, it's been the same gun/serial number the whole time. Put it another way, it's the handgun of Theseus. Do you have to take it to that extreme, no. But you could.   |
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Quoted: Is the 320 the one w the reported issues? So, its just a trigger group? Interesting… Yes, although I don't believe anyone has demonstrated how one has fired without the trigger being pulled. While it does feature a fully clocked striker, instead of partially cocked, it has two internal safeties, one of which physically blocks the striker from passing through the breechface unless the trigger is pulled at least partially rearward. Thus, uncommanded discharge doesn't seem possible unless something in the FCU is broken. That said, there was a recent jury award to someone who claimed this happened, but if it didn't, it wouldn't be the first time a jury awarded based on feels instead of technical merit. I haven't looked at the issue in some time, but at one point it seemed like a significant percentage of these were in light bearing holsters that perhaps allowed something to get in between the holster and the pistol. The Sig Mechanic on YouTube has a great series of videos on how the FCU functions and the internal safeties. |
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Quoted: Also, I believe part of the confusion Glock folks have with the P320 is that a Glock model (e.g., G19) implies a certain slide length and grip length. The general P320 model name does not. It's the name of the modular platform, which can be configured with a wide range of slide styles/lengths and grip module styles/lengths/thicknesses. The first P320s came in four slide/grip combinations, with 4 calibers (9mm, 40s&w, 357sig, 45acp) available in each size: Subcompact - short slide and grip length, like a G26, G27, G39, ... Compact - medium slide and grip length - like a G19, G23, ... Carry - medium slide and long grip length, like a 19x, ...and ? Full - long slide and grip length, like a G17, G22, ... So initially, the P320 model name without the subtype was actually referring to 16 different models, which covered a large portion of available Glock models, and some slid/grip length combinations and calibers they did not. For example, the 19x showed up long after Sig had the Carry model with long (full size) grip and shorter slide. And I believe those all shipped with medium thickness grip modules. They also offered small and large thickness grip modules. Sig has since moved on and stopped selling a subcompact model (because the P365 ate that market) and models in 357sig and 45acp, but they added a 10mm option. They also now offer models with a manual safety. Really, it's hard to track their models now because they introduce new options fairly regularly, but they are all built around the same P320 FCU design that works with pretty much any P320 grip module or slide (exception for 45acp). And Sig and third parties sell a wide range of aftermarket options for both. You can purchase weighted grip modules, tungsten infused grips modules, all aluminum grip modules, grip modules with an embedded laser, and more. The options for slides are as varied. The FCU is also customizable to some extent, with replacement trigger bars and bows. The potential combinations are seemingly endless, and you can spend as much or as little as you like. As shown above, I've made significant changes to two of mine, but I have a another first gen model that is bone stock. And it still works just fine. BTW, you might hear the term "upgraded". Sig had a rolling design change early on to address the drop safe issue, and they offered folks who had the prior revision (like me) a free service to upgrade their pistol to the new design (which I did). There were a range of changes made in that upgrade, and it was well worth taking the time to send it in IMO. Since you said you are looking at a used P320, it's worth looking into whether or not it is an older model with the original design the owner didn't have Sig upgrade, but I suspect those represent a very small percentage of P320s in the wild now. That design change was quite some time ago. Excellent post! |
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Very cool. Do they consider that to be a brace? |
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Quoted: Thanks, everyone. I get it now. Do they sell the FCU separately? I'm getting there... Quoted: Thanks, everyone. I get it now. Do they sell the FCU separately? Quoted: I do that with my registered lower. The comparison is a good one. Now I want a P320 too. I'm getting there... A local charity has been selling raffle tickets for a P320 since August and drew the winner Monday. Looks like I'm the guy that won it and heading to pick it up in a few. This has been a good thread to read. |
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They are like a Swiss Army Gun. Lower left started as a P320 M17. Now currently in an X5 grip with a compact .40 upper. I also have the original M17 upper, a compact 9mm upper, another with an optic and a full size .40 S&W upper. Lower right started as a full size .45 acp. Now in a X10 grip I modified to carry length and a stainless compact upper and the original full size .45 upper. I also had an X10 10mm upper but sold it. I had enough grips and uppers in the safe I bought an FCU from GB to make an extra gun. That is on the upper right currently in a carry grip with the 9mm compact upper. Attached File |
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Quoted: Thanks, everyone. I get it now. Do they sell the FCU separately? I'm getting there... They do sell the FCU separately. They are available in black and gold. |
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I had a P250 and P320. The 250 was the hammer fired predecessor to the striker fired 320. The 250 supported more calibers like 22lr and 380. My 320 was a 45acp model. While it is not officially supported, you can use all the lower calibers with the 45acp FCU. I think the reason they say it doesn't work is because the magazine safety doesn't work when you run 9mm mags in the 45 FCU. In addition to the length of the grip and the slide length, there are also different grip girths like slim, medium, and thicccc. I had a few different ones. There was a small letter on the bottom of the backstrap that signifies the grip width. The most common is the M. The very early grips and mags looked similar, but were not the same as the ones that came later. The next generation of grips was the X. There was X full and X carry. They feel a lot nicer than the older style. You could buy the grips from sig for $5 on sale. The metal weight was sold separately if you wanted it. I think the older mags did not work with the X grips. The 250 slides and FCU would fit in the X grips. |
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Damn - $399.  I found a few used, entire pistols for that (or less). I'd prefer to go that route. At least I'd have something to start with. I mean, for contrast, I bought some Dagger frames for $49. 
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Quoted: Damn - $399. I found a few used, entire pistols for that (or less). I'd prefer to go that route. At least I'd have something to start with. I mean, for contrast, I bought some Dagger frames for $49. Quoted: Damn - $399. I found a few used, entire pistols for that (or less). I'd prefer to go that route. At least I'd have something to start with. I mean, for contrast, I bought some Dagger frames for $49. They can be found for a lot less. I recently got a new take-off FCU off GB for $199 which included a compact grip module. There were quite a few on there. |
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Quoted: Damn - $399. I found a few used, entire pistols for that (or less). I'd prefer to go that route. At least I'd have something to start with. I mean, for contrast, I bought some Dagger frames for $49. Yeah, their pricing is pretty ridiculous. You can get a full P320 for not much more. Like $30 more. https://dirtybirdusa.com/products/sig-sauer-p320-nitron-3-9-9mm-15rd-compact-semi-auto-pistol-black/?avad=211021_a3e2b61d5 My advice - search for a model that has your preference for manual safety (or not) and a slide you like, in terms of length/style/sights/optic cut, and then swap out the grip module later if you see something you like better. |
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Quoted: Thanks, everyone. I get it now. Do they sell the FCU separately? I know this was already answered, but I wanted to add that I personally think it’s more affordable to buy a complete pistol and sell the components that you don’t want / need. While the FCU that SIG sells separately is a Custom Shop version with a flat trigger, from others’ feedback here, I’m not sure that it offers any real advantages for the premium price. In my experience, you can buy a complete pistol and sell the components (keep the magazines), resulting in an FCU that costs about $100-$200. I wanted what SIG calls an XCompact - 3.6” barrel with a shorter 15-round grip and a flat trigger - but wanted a manual safety to match my M17. I bought this M18: Attached File And turned it into this, with only the FCU left from the original pistol after selling the slide assembly and grip module: Attached File I really enjoy tinkering with different configurations like this to build the pistol I want. The only thing I’m disappointed about with the P320 line is that they’ve mostly done away with different calibers, which is understandable since .40 especially has fallen out of favor, but they also seem to be only interested in full size 17-round grips. They still support the 15-round Compact with parts and magazines, but I don’t think they produce any complete pistols in that configuration anymore. I know they’re focused on the P365 now, but I still enjoy the size and feel of the Compact grip. I’d really like to have a Compact-sized aluminum AXG grip module, but I’m sure we’ll never see that. |
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Quoted: I know this was already answered, but I wanted to add that I personally think it’s more affordable to buy a complete pistol and sell the components that you don’t want / need. While the FCU that SIG sells separately is a Custom Shop version with a flat trigger, from others’ feedback here, I’m not sure that it offers any real advantages for the premium price. In my experience, you can buy a complete pistol and sell the components (keep the magazines), resulting in an FCU that costs about $100-$200. I wanted what SIG calls an XCompact - 3.6” barrel with a shorter 15-round grip and a flat trigger - but wanted a manual safety to match my M17. I bought this M18: https://www.ar15.com/media/mediaFiles/27888/M18_Black_01_jpg-2625270.JPG And turned it into this, with only the FCU left from the original pistol after selling the slide assembly and grip module: https://www.ar15.com/media/mediaFiles/27888/M18_Wilson_Combat_XCompact_Manual_Safety-3390634.JPG I really enjoy tinkering with different configurations like this to build the pistol I want. The only thing I’m disappointed about with the P320 line is that they’ve mostly done away with different calibers, which is understandable since .40 especially has fallen out of favor, but they also seem to be only interested in full size 17-round grips. They still support the 15-round Compact with parts and magazines, but I don’t think they produce any complete pistols in that configuration anymore. I know they’re focused on the P365 now, but I still enjoy the size and feel of the Compact grip. I’d really like to have a Compact-sized aluminum AXG grip module, but I’m sure we’ll never see that. I pretty much want to do the same exact thing except keep the gun FDE and use an xcompact module. |
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Quoted: I pretty much want to do the same exact thing except keep the gun FDE and use an xcompact module. That was my most recent project from a tan M18 I picked up from a Black Friday sale: Attached File |
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Quoted: I know this was already answered, but I wanted to add that I personally think it’s more affordable to buy a complete pistol and sell the components that you don’t want / need. While the FCU that SIG sells separately is a Custom Shop version with a flat trigger, from others’ feedback here, I’m not sure that it offers any real advantages for the premium price. In my experience, you can buy a complete pistol and sell the components (keep the magazines), resulting in an FCU that costs about $100-$200. I wanted what SIG calls an XCompact - 3.6” barrel with a shorter 15-round grip and a flat trigger - but wanted a manual safety to match my M17. I bought this M18: https://www.ar15.com/media/mediaFiles/27888/M18_Black_01_jpg-2625270.JPG And turned it into this, with only the FCU left from the original pistol after selling the slide assembly and grip module: https://www.ar15.com/media/mediaFiles/27888/M18_Wilson_Combat_XCompact_Manual_Safety-3390634.JPG I really enjoy tinkering with different configurations like this to build the pistol I want. The only thing I’m disappointed about with the P320 line is that they’ve mostly done away with different calibers, which is understandable since .40 especially has fallen out of favor, but they also seem to be only interested in full size 17-round grips. They still support the 15-round Compact with parts and magazines, but I don’t think they produce any complete pistols in that configuration anymore. I know they’re focused on the P365 now, but I still enjoy the size and feel of the Compact grip. I’d really like to have a Compact-sized aluminum AXG grip module, but I’m sure we’ll never see that. Also new to the platform, did you just change the trigger shoe on your original FCU to the flat trigger? If so, easy? I guess I can YouTube and Google but, I'd like to hear from one of us. Is there any difference in the after market FCU and a complete gun FCU other than the trigger shoe? Thanks. |
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Quoted: Also new to the platform, did you just change the trigger shoe on your original FCU to the flat trigger? If so, easy? I guess I can YouTube and Google but, I'd like to hear from one of us. Is there any difference in the after market FCU and a complete gun FCU other than the trigger shoe? Thanks. Quoted: Quoted: I know this was already answered, but I wanted to add that I personally think it’s more affordable to buy a complete pistol and sell the components that you don’t want / need. While the FCU that SIG sells separately is a Custom Shop version with a flat trigger, from others’ feedback here, I’m not sure that it offers any real advantages for the premium price. In my experience, you can buy a complete pistol and sell the components (keep the magazines), resulting in an FCU that costs about $100-$200. I wanted what SIG calls an XCompact - 3.6” barrel with a shorter 15-round grip and a flat trigger - but wanted a manual safety to match my M17. I bought this M18: https://www.ar15.com/media/mediaFiles/27888/M18_Black_01_jpg-2625270.JPG And turned it into this, with only the FCU left from the original pistol after selling the slide assembly and grip module: https://www.ar15.com/media/mediaFiles/27888/M18_Wilson_Combat_XCompact_Manual_Safety-3390634.JPG I really enjoy tinkering with different configurations like this to build the pistol I want. The only thing I’m disappointed about with the P320 line is that they’ve mostly done away with different calibers, which is understandable since .40 especially has fallen out of favor, but they also seem to be only interested in full size 17-round grips. They still support the 15-round Compact with parts and magazines, but I don’t think they produce any complete pistols in that configuration anymore. I know they’re focused on the P365 now, but I still enjoy the size and feel of the Compact grip. I’d really like to have a Compact-sized aluminum AXG grip module, but I’m sure we’ll never see that. Also new to the platform, did you just change the trigger shoe on your original FCU to the flat trigger? If so, easy? I guess I can YouTube and Google but, I'd like to hear from one of us. Is there any difference in the after market FCU and a complete gun FCU other than the trigger shoe? Thanks. 3ACR is much more knowledgeable than I am on these. Changing trigger out is very easy. I had a curved trigger and purchased the sig flat one. It was out of spec. Got an apex and it went in fine. Not Glock level easy but still pretty simple. ETA I think sig is still the only fcu around. I know there are/were 80% options though. The custom shop fcu just comes with a flat trigger and nothing else. I have one for a 365 and there is nothing special. |
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Quoted: 3ACR is much more knowledgeable than I am on these. Changing trigger out is very easy. I had a curved trigger and purchased the sig flat one. It was out of spec. Got an apex and it went in fine. Not Glock level easy but still pretty simple. ETA I think sig is still the only fcu around. I know there are/were 80% options though. The custom shop fcu just comes with a flat trigger and nothing else. I have one for a 365 and there is nothing special. Quoted: Quoted: Quoted: I know this was already answered, but I wanted to add that I personally think it’s more affordable to buy a complete pistol and sell the components that you don’t want / need. While the FCU that SIG sells separately is a Custom Shop version with a flat trigger, from others’ feedback here, I’m not sure that it offers any real advantages for the premium price. In my experience, you can buy a complete pistol and sell the components (keep the magazines), resulting in an FCU that costs about $100-$200. I wanted what SIG calls an XCompact - 3.6” barrel with a shorter 15-round grip and a flat trigger - but wanted a manual safety to match my M17. I bought this M18: https://www.ar15.com/media/mediaFiles/27888/M18_Black_01_jpg-2625270.JPG And turned it into this, with only the FCU left from the original pistol after selling the slide assembly and grip module: https://www.ar15.com/media/mediaFiles/27888/M18_Wilson_Combat_XCompact_Manual_Safety-3390634.JPG I really enjoy tinkering with different configurations like this to build the pistol I want. The only thing I’m disappointed about with the P320 line is that they’ve mostly done away with different calibers, which is understandable since .40 especially has fallen out of favor, but they also seem to be only interested in full size 17-round grips. They still support the 15-round Compact with parts and magazines, but I don’t think they produce any complete pistols in that configuration anymore. I know they’re focused on the P365 now, but I still enjoy the size and feel of the Compact grip. I’d really like to have a Compact-sized aluminum AXG grip module, but I’m sure we’ll never see that. Also new to the platform, did you just change the trigger shoe on your original FCU to the flat trigger? If so, easy? I guess I can YouTube and Google but, I'd like to hear from one of us. Is there any difference in the after market FCU and a complete gun FCU other than the trigger shoe? Thanks. 3ACR is much more knowledgeable than I am on these. Changing trigger out is very easy. I had a curved trigger and purchased the sig flat one. It was out of spec. Got an apex and it went in fine. Not Glock level easy but still pretty simple. ETA I think sig is still the only fcu around. I know there are/were 80% options though. The custom shop fcu just comes with a flat trigger and nothing else. I have one for a 365 and there is nothing special. Thanks, this helps. |
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Quoted: Also new to the platform, did you just change the trigger shoe on your original FCU to the flat trigger? If so, easy? Yes, I just changed out the trigger “shoe” for the SIG factory flat trigger, which I think is a big improvement. It’s a bit “fiddly” - one of those tasks where you sometimes wish you had an extra hand - but after you do it once, it makes sense and is fairly straightforward. This is a good video demonstrating how to do it:  Apex trigger install video for the SIG Sauer P320 |
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Quoted: Damn - $399. I found a few used, entire pistols for that (or less). I'd prefer to go that route. At least I'd have something to start with. I mean, for contrast, I bought some Dagger frames for $49. Quoted: Damn - $399. I found a few used, entire pistols for that (or less). I'd prefer to go that route. At least I'd have something to start with. I mean, for contrast, I bought some Dagger frames for $49. Check the EE or other places. I just sold a 320 FCU for $225 to a local. There are complete PD trade in 320s for $350-400. It's cheaper to buy one, sell all the parts you don't need and start over (although older ones might not have the flat trigger, if you care). |
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Quoted: Yes, I just changed out the trigger “shoe” for the SIG factory flat trigger, which I think is a big improvement. It’s a bit “fiddly” - one of those tasks where you sometimes wish you had an extra hand - but after you do it once, it makes sense and is fairly straightforward. This is a good video demonstrating how to do it:  https://www.youtube.com/watch?v=RuUUI9wlTasI appreciate this. |
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Quoted: In my experience, you can buy a complete pistol and sell the components (keep the magazines), resulting in an FCU that costs about $100-$200. Quoted: In my experience, you can buy a complete pistol and sell the components (keep the magazines), resulting in an FCU that costs about $100-$200. Quoted: There are complete PD trade in 320s for $350-400. It's cheaper to buy one, sell all the parts you don't need and start over (although older ones might not have the flat trigger, if you care). Yeah, this makes a lot of sense to me. It's kinda why I asked about it in the first place. I've seen some fairly cheap used ones and it made me wonder if it's something I'd like, especially since it would be easy to modify. I do like the modular nature of it, but didn't really grasp how it went together. |
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Great thread. Only other item I’ll mention will be a used weapon. My 1st p320 compact was one that was returned to the factory for the mod. I purchased another grip for it and noticed I couldn’t drop the slide release. Was like hmm what am I doing wrong. Found out design change for slide release. I ordered one from sig guy watch the utube video to swap it out. Fixed the slide drop issue. Just beware older fcu might have to change some of the parts out as the design has changed. To work correctly. |
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Quoted:In practice, it feels like Glock and their many clones are ahead in this game. That platform isn't designed around modularity, but Glock just has so much more market share. The big difference for me is the grip module. Assuming I have both full size and compact slides for both (which I do): With the P320 I order a couple Wilson combat grip modules, one compact for carry and one full size for fun at the range. I have about $160 invested after shipping and tax (Don't buy these direct from Wilson BTW). To do the same thing with the Glock I'd need to send the frame out to somebody for stippling, plus it's a serial numbered part so even if I sent just the frame, I'm shipping a handgun which is a huge PITA and extra expense. I'm looking at $300-500 for a really good stippling job after shipping and I still only have one frame size, so I'd need to buy another frame and send that one out to have that stippled again to have both a compact and full size. |
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Quoted: Damn - $399. I found a few used, entire pistols for that (or less). I'd prefer to go that route. At least I'd have something to start with. I mean, for contrast, I bought some Dagger frames for $49. https://www.brownells.com/gun-parts/handgun-parts/handgun-frames-parts/p320-fire-control-unit/ But yeah, it's much more cost effective to buy a complete P320 in a configuration you like. Then you get the FCU plus a spare slide, barrel, at least two mags, etc. Then go buy different grip modules, slides, etc. |
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Not a 320 owner, but the thing that has given me pause on the 320 ecosystem is the Sig branded grip frames are stoopid expensive for a piece of plastic. It looks like Magpul may be coming to the rescue though with $60 frames and it looks like Wilson and Strike have made a frame? How are these after market frames working out? is the quality there? |
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Congrats! That's a nice win! My first was an M17. Same exact kit bit with the longer slide. |
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Quoted: Not a 320 owner, but the thing that has given me pause on the 320 ecosystem is the Sig branded grip frames are stoopid expensive for a piece of plastic. It looks like Magpul may be coming to the rescue though with $60 frames and it looks like Wilson and Strike have made a frame? How are these after market frames working out? is the quality there? My favorite are the Wilson Frames. I really like them a lot (even compared to other guns, not just other P320 frames). You can get them at various places much cheaper than Wilson direct. I paid between $55-65 each for all mine. The quality is top notch, better than the Sig frames I think. The texture is like a really well done professional laser stippling job. The fit of the FCU and mags is perfect, as good as OEM Sig. I also have a couple Brouwer frames. Those were very expensive and I got them on sale. I like the ergos on these with the grip styled like a 1911. The texture is nowhere in the the same league as the Wilsons. The FCU fit is not as good as the Wilsons either. It's tight once it's in there, but getting the FCU in is a little fiddly. |
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Quoted: Not a 320 owner, but the thing that has given me pause on the 320 ecosystem is the Sig branded grip frames are stoopid expensive for a piece of plastic. It looks like Magpul may be coming to the rescue though with $60 frames and it looks like Wilson and Strike have made a frame? How are these after market frames working out? is the quality there? They were $35 when they first came out, with mag release and a conversion kit for the "new" style slide release. I've picked them up for half that from CDNN, without the mag release, but they don't have any great deals right now. Modguns has the old style for $63 right now, so they've definitely gotten quite a bit more expensive. Seems like they've aligned their prices with Wilson. |
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Quoted: Not a 320 owner, but the thing that has given me pause on the 320 ecosystem is the Sig branded grip frames are stoopid expensive for a piece of plastic. It looks like Magpul may be coming to the rescue though with $60 frames and it looks like Wilson and Strike have made a frame? How are these after market frames working out? is the quality there? Wilson Combat has the best frame IMO. There is also Icarus Precision, Mirzon, Amend2, and I'm sure a bunch I'm missing. |
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Quoted: My favorite are the Wilson Frames. I really like them a lot (even compared to other guns, not just other P320 frames). You can get them at various places much cheaper than Wilson direct. I paid between $55-65 each for all mine. The quality is top notch, better than the Sig frames I think. The texture is like a really well done professional laser stippling job. The fit of the FCU and mags is perfect, as good as OEM Sig. I also have a couple Brouwer frames. Those were very expensive and I got them on sale. I like the ergos on these with the grip styled like a 1911. The texture is nowhere in the the same league as the Wilsons. The FCU fit is not as good as the Wilsons either. It's tight once it's in there, but getting the FCU in is a little fiddly. Quoted: Quoted: Not a 320 owner, but the thing that has given me pause on the 320 ecosystem is the Sig branded grip frames are stoopid expensive for a piece of plastic. It looks like Magpul may be coming to the rescue though with $60 frames and it looks like Wilson and Strike have made a frame? How are these after market frames working out? is the quality there? My favorite are the Wilson Frames. I really like them a lot (even compared to other guns, not just other P320 frames). You can get them at various places much cheaper than Wilson direct. I paid between $55-65 each for all mine. The quality is top notch, better than the Sig frames I think. The texture is like a really well done professional laser stippling job. The fit of the FCU and mags is perfect, as good as OEM Sig. I also have a couple Brouwer frames. Those were very expensive and I got them on sale. I like the ergos on these with the grip styled like a 1911. The texture is nowhere in the the same league as the Wilsons. The FCU fit is not as good as the Wilsons either. It's tight once it's in there, but getting the FCU in is a little fiddly. That's the one thing I liked of the p-365 I had. Of the three group frames, the XL Wilson Combat felt the best. Wilson combat comes up with one of their grip frames for the Ruger RXM, that will be awesome. |
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Quoted:That's the one thing I liked of the p-365 I had. Of the three group frames, the XL Wilson Combat felt the best. Wilson combat comes up with one of their grip frames for the Ruger RXM, that will be awesome. Agree on both points! All I use with my two P365s are the Wilson grip modules. I have a small one for pocket carry and an XL for holster carry. The original Sig ones are put away in the guns' original boxes. |