User Panel
'97 Jeep XJ Owner, former '98 XJ Owner
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Stock Options (written by Spart)
Caveats RRA LAR-8 and Bushmaster BAR-10 308 (pre-2010) caveat: these guns have a proprietary design with proprietary buffers. RRA goes out of their way to state this on their website. The design started life as the Bushmaster BAR-10 and the design was sold to RRA, who have continued marketing it as the LAR-8 it after making small changes. Bushmaster has been selling rebadged DPMS LR-308's as the Bushmaster ORC and Hunter 308 lines since 2010, and this caveat does not apply to those rifles. Bushmaster BAR-10 and RRA LAR-8 actions have a longer stroke, and thus a shorter buffer compared to every other 308 AR out there. Take a look at this picture of an LAR-8, the receivers are a bit odd (long) in proportion to most 308 AR's. The reason is the proprietary bolt catch/release, which is positioned similarly to an ACR or Beretta ARX. Therefore nothing in this section is applicable to these rifles, however Slash does sell buffers for these rifles on his website. DPMS GII LR-308 caveat: these guns have a new proprietary design, and according to DPMS their carbine buffer and spring do not interchange with the gen one rifles. I assume that none of this information pertains to the GII rifles. It could be that they have gone to a system that splits the difference between ArmaLite and DPMS in order to achieve a system that is 100% proprietary in nature, but that's just conjecture on my part. HK MR762/HK417 caveat: The receiver extension on these rifles is much larger in diameter and completely different and incompatible with all aftermarket stocks because you suck and HK hates you. Action length 308 vs. 5.56 The first thing you need to know is that AR-10 and 308 AR rifles have a longer action length than AR-15 rifles. The actual action length isn't super important (and will vary even between rifles of the same make and model due to variations in the way the receiver and receiver extension are threaded) but it is important to know that it is around 3/4" longer than an AR-15 action. This means that the BCG is moving an additional 3/4" into the stock, the charging handle is moving an additional 3/4" to the rear, and for these reasons you cannot swap an AR-15 stock, buffer and action spring system wholesale to a 308 rifle. Many AR-15 parts can be used with 308 rifles when combined with the correct 308 specific components. Rifle stocks Rifle stocks for AR-10/308AR's are by and large the same as AR-15 rifle stocks. Due to the longer action length, a stock with a cheek riser that works on an AR-15 may interfere with a 308 AR's charging handle. Magpul sells a version of their PRS for 308 AR's specifically to address this issue, however the standard AR15 PRS can be modified by cutting the cheek riser, and I assume other stocks with adjustable comb height could be similarly modified. Rifle buffers for 308 rifle stocks are not the same as AR-15 components, they are 308-specific. Standard(ish) 308 rifle buffers are slightly heavier and about 3/4" shorter than the AR-15 rifle buffer to accommodate the longer action stroke. ArmaLite EA1090 - Listed as 5.1875", 5.4 ounces DMPS 308-BS-11 - Listed as 5.25", 5.4112 ounces Slash Heavy Buffer - Listed as 5.200", 10.0 ounces. Action springs for 308 rifle stocks are also not the same as AR-15 components. They are higher rate springs. Slash recommends the ArmaLite part FWIW. ArmaLite EA1095 DPMS 308-BS-10B TUBB ARBUFSR JP JPS-OSR.308 JP JPSCS-10 - proprietary captured system with springs, must use included spacer, alternative springs available as JPSCS-PACK10 JP JPSCS-10K - as above with alternative springs, must use included spacer. Carbine stocks Here's where things get muddy. There are two competing standards for carbine stock systems in 308 AR rifles, and it goes beyond the commercial/mil-spec dichotomy found in AR-15 carbine stock systems. The first system, which I will refer to as the ArmaLite AR-10 style carbine stock system or "ArmaLite style system" for short, uses AR-15 carbine buffers. As stated earlier, the stroke of a 308 AR's action (and thus the stroke of the BCG inside the receiver extension) is around 3/4" longer than in an AR-15, and so for this system there are 308-specific receiver extensions that are around 7 3/4" long internally vs. 7" internally on the AR-15 variety. The second system, which I will refer to as the DPMS LR-308 style carbine stock system or "DMPS style system" for short, uses AR-15 carbine receiver extensions. Again, due to the longer stroke of the 308 AR action, a 308-specific buffer is used that is around 3/4" shorter than an AR-15 carbine buffer. This picture illustrates the difference between ArmaLite AR-10 style carbine receiver extensions and the AR-15 carbine receiver extension used in the DPMS style system: http://i.imgur.com/zMb8y6a.jpg This picture illustrates the difference between DPMS LR-308 style carbine buffers and the AR-15 carbine buffer used in the ArmaLite style system: http://i.imgur.com/EPYhwpe.jpg ArmaLite AR-10 style carbine stock system ArmaLite and several other manufacturers (complete list at the bottom of this section) utilize an AR-15 carbine buffer in conjunction with a 308-specific action spring and receiver extension. You can use any carbine stock that matches the OD of your tube (commercial vs. mil-spec) however see the notes below on which setups will either not fully collapse or over collapse. The buffer ArmaLite uses is identical to an AR-15 H3 buffer. It contains three tungsten weights and weighs 5.4 ounces. Other manufacturers that use this system style may use differently weighted buffers from standard carbine all the way through H3. If you need to go heavier than an H3, the AR-15 buffers listed on Slash's site will work and he recommends the XH. Action springs are 308-specific and are of a higher rate than AR-15 carbine springs. ArmaLite EA1095 - This is the same as for the ArmaLite rifle stock and is what I use in my carbine stock. TUBB ARBUFSR Sprinco "RED" Spring Receiver extensions are 308-specific and are about 3/4" longer than AR-15 receiver extensions (see pic above.) Depending on the receiver extension used, you can fully collapse elongated stocks such as the VLTOR Emod and MagPul ACS/ACS-L/STR stocks. On the flip side, if you use a stock with no back (visible hole in the rear of the stock as with a mil-spec collapsible stock) it is possible to over collapse a standard length stock on an extension that allows an elongated stock to fully collapse. Several manufacturers offer the 308-specific receiver extension for sale separately: VLTOR RE-A5 - mil-spec OD, allows elongated stocks to fully collapse. VLTOR RE-10/A5SR - mil-spec OD, will not allow elongated stocks to fully collapse or standard stocks to over collapse. ArmaLite 10207025 - mil-spec OD, will not allow elongated stocks to fully collapse or standard stocks to over collapse. POF 00517 Buffer Tube, Anti-Tilt (7-Position) - mil-spec OD, allows elongated stocks to fully collapse. Anti-tilt feature for op-rod guns. LaRue LT629-15C for 7.62 - Select the 7.62 option, mil-spec OD, will not allow elongated stocks to fully collapse or a standard stock to over collapse. Incidentally, the non-VLTOR tubes will probably work with VLTOR A5 buffers in an AR-15. I have not verified this, but I don't know why it wouldn't work. Could be of interest to folks who want an anti-tilt receiver extension with an A5 buffer in an op-rod AR-15 - POF may have you covered. Stocks are standard AR-15, and all of the receiver extensions I have found utilize the mil-spec diameter, so you'd have to use a mil-spec stock. As mentioned above, if you choose the right receiver extension you can fully collapse an elongated stock such as the VLTOR EMOD and MagPul ACS/ACS-L/STR. If you wish to use a stock with an open rear, make sure to choose a receiver extension that will not let you over-collapse the stock. Complete stock kits are available from additional manufacturers that do not offer the parts individually: KAC offers the "M110 Collapsible Stock Kit," part number 25951. It's not listed on their website but you can purchase it through their dealer network, e.g. here. This kit appears unique in that it utilizes a ten position receiver extension, whereas the other receiver extensions available are either seven or six position. It appears to allow elongated stocks to fully collapse and comes with the MagPul ACS. LMT offers a few different kits: LMT L7LA2CT - I can only assume this is mil-spec OD since LMT's SOPMOD stock is mil-spec, the stock is not long enough to fully collapse. LMT L7LA2C - As above only in black. LMT DMR308-KIT - same guts as above but with LMT's DMR stock that resembles a MagPul PRS. It slips on over the carbine style receiver extension whereas the PRS utilizes a rifle receiver extension. The following rifle lines utilize the ArmaLite style system, albeit with their own flavor of buffer weights and springs: ArmaLite AR-10 KAC M110 (when equipped with above-referenced kit) KAC 16” SR25 EC and ECC, see here.) LMT LM308 POF mfg Oct 2012 or later, see note at bottom of page here. S&W M&P10 - known to use smaller gas ports and lighter buffers. Rifle stock systems use the carbine buffer/spring and a spacer. LaRue 7.62 PSA PA-10* Sig 716 - certain models use the DPMS style system instead. Ruger SR-762 * Apparently many if not all of the first PSA PA-10 rifles to ship came with the ArmaLite length tube, but the DPMS shorty buffer. This caused the shoulder on the BCG to slam into the lower receiver and receiver extension causing damage. Apparently moving forward, they are using the correct AR-15 length buffer and if you have one of the DPMS shorty buffers, you NEED to call them and get a replacement. Your buffer spring may also be incorrect, count the coils and measure the length, should be about a foot long with 27 coils. Because of this fuckery I can't recommend buying PSA parts, although their receiver extension might be an option in the future if you can get them to sell it by itself for less than what the other options on the market cost. DPMS LR-308 style carbine stock system DPMS and several other manufactures (complete list at bottom of this section) utilize an AR-15 receiver extension in conjunction with a 308-specific buffer and action spring. You can use any carbine stock that matches the OD of your tube (commercial vs. mil-spec.) The buffer DPMS uses looks like a cut-down AR-15 carbine buffer. It is around 3/4" shorter. You can see a comparison pic above. There are a few options for buffers: DPMS 308-CS-10B - this is the standard DPMS buffer. Slash CAR-10 buffers - Available in 5.5oz and XH 6.5oz. Slash recommends his proprietary spring for use with these. Buffer Technologies KynSHOT KSRB5004 - Hydraulic recoil damper. JP JPSCS-10 - proprietary captured system with springs, alternative springs available as JPSCS-PACK10 JP JPSCS-10K - as above with alternative springs. Other companies may make something very similar to the DPMS buffer, but they've gotten pretty generic by now similar to mil-spec AR-15 buffers. Action springs are specific to the DPMS LR-308 style system. Springs that work in the ArmaLite AR-10 style system will not work with the DPMS style system. DPMS 308-CS-10A JP JPS-OSC.308 JP JPSCS-10 - proprietary captured system with buffer weights, alternative springs available as JPSCS-PACK10 JP JPSCS-10K - as above with alternative springs. Slash .308 CARBINE Buffer Spring - Custom Sprinco "ORANGE" Spring Any AR-15 carbine receiver extension will work with the above components, commercial or mil-spec. If you want to run a MagPul UBR on your rifle, they're the only way to go. The following rifle lines utilize the DPMS style system, albeit with their own flavor of buffer weights and springs: DPMS LR-308 Gen 1 Rifles Bushmaster 2010+ Remington POF prior to Oct 2012 Black Rain Ordinance CMMG Colt 901 Fulton Armory FAR-308 LWRC REPR Wilson Combat .308 JP LRP-07 SIG 716 - certain models use the ArmaLite style system instead. |
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'97 Jeep XJ Owner, former '98 XJ Owner
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'97 Jeep XJ Owner, former '98 XJ Owner
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Hello all! I was an unfortunate one that picked up on the PA10 thing. So, am I correct in assuming the PA10 buffer system is similar to the Armalite? It uses the longer extension and an AR15 buffer. What about the spring? Can I replace the spring with an Armalite style spring and NOT the DPMS style? Just trying to clear things up. Thanks
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Originally Posted By eddieg1274:
Hello all! I was an unfortunate one that picked up on the PA10 thing. So, am I correct in assuming the PA10 buffer system is similar to the Armalite? It uses the longer extension and an AR15 buffer. What about the spring? Can I replace the spring with an Armalite style spring and NOT the DPMS style? Just trying to clear things up. Thanks View Quote You'll have to try and see. Fortunately, the springs are cheap. What problem are you experiencing that would lead you to change springs? The whole thing works as a system - how much gas you're getting will determine which buffers and springs will work best for you. There is no one-size-fits-all. For this exact reason I went with an adjustable gas block on my franken-308AR build so I could make changes without having to swap parts. I run the ArmaLite spring, but I could run a heavier or lighter spring and tune the gas to work with it. I don't have a reason to though, it's been 100% reliable with no cleaning for about 400 rounds. |
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JP Enterprises JPSCS-10H buffer does NOT work in the new DPMS GII rifles. Stroke of buffer too short to cycle BCG far enough to engage bolt lock. Glad I found out before I tried to fire! Could modify bolt to make work but have an email to JP to see if they already have a fix for it.
Just an FYI. |
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Hey guys, I posted my problems here - but to ask it in short form:
Can failure to feeds be caused by being over-gassed or should I look at my buffer first (Armalite Rifle, 5.4oz)? |
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Cry in the Dojo, Laugh on the Battlefield
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Maybe not an appropriate question but what issues are encountered with the AR 10 variations and FSB (Front Sight Base) as opposed to gas blocks on the DI (Direct Impingement) systems?
Also, are there any op rod kits available as mods for the AR10s and SR25/DPMS style rifles? Note: In reference to the above questions, are there further differences as regard rifle lengths e.g. carbine, rifle, etc.? Lastly, there are multitudes of problems with gassing on DI systems... can those be mitigated with op rod (gas piston) systems? |
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Hello, I asked this on the main board but maybe it should go here instead. I've been searching around for the answer to who makes a 308 80% lower jig that will match up with PSA uppers. I have been looking for jigs for both ar15 and 308. Kinda settled on tactical machining jigs but not sure they are compatible since PSA seems to have their own setup. If no one makes a matching jig then please suggest who makes one and who has budget uppers for 308. I know I can buy a completed lower cheaper but for privacy reasons and since I am a DIYer, I want to build my own. Thanks.
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Who is currently making the lightest .308/762 receiver sets? Any new 2016 introductions?
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colawarrior.org
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Originally Posted By JoshAston:
2A Arms Xanthos should be out real soon, 16.6 ounces for the set. View Quote View All Quotes View All Quotes Originally Posted By JoshAston:
Originally Posted By Sanlanman:
Who is currently making the lightest .308/762 receiver sets? Any new 2016 introductions? 2A Arms Xanthos should be out real soon, 16.6 ounces for the set. They're on their website. DPMS high profile. A guy on the 68 forum is buildign a 16" AR308 with a projected finish weight under 4.5 lbs. UNDER 4.5 POUNDS. |
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I know that the barrel nut is different between the AR15 and the LR308, but the standard barrel nut wrench works on both.
Does anybody know if they use the same Delta ring pack? |
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I knew daredevils and I ain't got nothin' against them, ........it's just they're all dead.
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Originally Posted By Lon_Moer:
I know that the barrel nut is different between the AR15 and the LR308, but the standard barrel nut wrench works on both. Does anybody know if they use the same Delta ring pack? View Quote Maybe if you offset the teeth and bind up on the nut without full purchase. There are some barrel nuts that work with the AR15 wrench. The JP AR10 handguard system is one example. Most don't, however. |
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Originally Posted By Forest:
I'm thinking with all the .308 ARs out there should we have a FAQ that addresses them. Please post what you know, I'll format this up into a content page, just like we're doing with the other FAQs. Thanks! Wikipedia Entry on 7.62x51 / 7.62 NATO Wikipedia Entry on .308 Winchester History of the AR-10 and AR-10 type .308 AR rifles Q: Don't all 'AR-10s' / .308 ARs use the same parts? A: NO! There are several different upper receiver styles, 3 different magazine formats used, and RRA even uses a different thread for their upper receivers (so you can't use standard barrel nuts or free float systems). For more infomation see: The AR15.com Armalite AR-10 FAQ as well as continue reading below. Q: What parts are different from company to company? A: Upper Receivers, Barrel nuts (Armalite, DPMS, and RRA use different thread pitches), magazines may be different, gas tubes can be different (Armalite's are longer than DPMS's). Q: What parts from an AR-15 can I use in a .308 rifle? A: (from the AR-10 FAQ) The AR-15 Bolt catch should work on KAC/DPMS type lowers, but not AR-10 type lowers. From DnPRK: Most AR trigger assemblies will fit an LR-308. The two triggers that require modification are 1) the Chip McCormick straight trigger which needs th end of the trigger clipped to clear the trigger guard and 2) the RRA trigger which might require the tip of the cocked hammer to be clipped to prevent it from dragging on the bottom of the bolt carrier. An AR-15 rifle buffer tube will fit an LR-308, but you need the 308 rifle buffer and spring. A CAR-15/M-4 collapsible stock buffer tube will fit an LR-308 but you need to use a Slash shortened buffer and 308 spring, or use Armalite's collapsible stock buffer, tube and spring for the AR-10 carbine. DPMS LR-308 Lower Receiver Assembly Do not trust the schematics in the DPMS dealer catalog! Mine (2009) had many errors that I only discovered by accident. Having just tonight completed assembling my LR-308 lower, I though you might find this useful - Carbine_Man. Essential LR-308 Lower Receiver Parts Many AR-15 lower parts are compatible with the LR-308, but the parts listed here are NOT AR-15 COMPATIBLE and must be included in your build. DPMS part numbers to the screw Other things to note:
Q: Are the AR10 and LR-308 Lower parts kits interchangable? A: (from shrikefan) YES, however, the fit will not be ideal and the pins may require some polishing down to size with emory cloth. The pivot pin and the takedown pin will be too short or too long depending on which kit is used with which lower. Not the IDEAL set-up but it will work in a pinch. The bolt stop may or may not work but it is not critical for the BANG function of the gun. Rifle Manufacturers Custom Rifle Builders Sources for Complete Uppers What lowers do these work on? Sources for Stripped Lowers Sources for Stripped Uppers Sources for Bolts Barrel Manufacturers Whose Uppers fit whose Lowers? A: Armalite uppers will fit on DPMS lowers, but they are non functional and you'll have a gap in the back where the Armalite upper has the 45 degree angle cut. DPMS uppers WILL NOT fit on a Armalite lower. Stock Options See Page 7 for Stock Options (thanks to Spart) FF Tube/Rail Options Other Specialty Parts Magazines There are primarily two magazines styles for the .308 rifles, the original Armalite-Fairchild magazines used in the original AR-10s, then picked up by the KAC SR-25 (henceforth called the SR-25 Type) and the Modern Armalite AR-10 type which is a modified M-14 magazine. It should be pointed out RRA (and formerly Bushmaster) make rifles that use FAL magazines, and CMMG has a lower which uses G3 magazines. Magazine Manufacturers Alternate Calibers for use with the .308/7.62x51 Lowers? View Quote In your caliber section, there is Also a 460 raptor which was designed to exceed the 458 socom/50 Beowulf. I believe it uses 460 s&w cartridges. |
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I want to die like my uncle did, peacefully in his sleep and not screaming and crying like the people in his car. -J Handy
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Bump
Posted Via AR15.Com Mobile |
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"Mistakes that are made are the gifts that keep giving"
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Originally Posted By eddieg1274:
Hello all! I was an unfortunate one that picked up on the PA10 thing. So, am I correct in assuming the PA10 buffer system is similar to the Armalite? It uses the longer extension and an AR15 buffer. What about the spring? Can I replace the spring with an Armalite style spring and NOT the DPMS style? Just trying to clear things up. Thanks View Quote Nothing bad about having a PSA PA10. The Magpul UBR with slash CAR10 buffer and spring works just fine. I think it's a fine platform. |
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Originally Posted By sharpshooter33:
Nothing bad about having a PSA PA10. The Magpul UBR with slash CAR10 buffer and spring works just fine. I think it's a fine platform. View Quote View All Quotes View All Quotes Originally Posted By sharpshooter33:
Originally Posted By eddieg1274:
Hello all! I was an unfortunate one that picked up on the PA10 thing. So, am I correct in assuming the PA10 buffer system is similar to the Armalite? It uses the longer extension and an AR15 buffer. What about the spring? Can I replace the spring with an Armalite style spring and NOT the DPMS style? Just trying to clear things up. Thanks Nothing bad about having a PSA PA10. The Magpul UBR with slash CAR10 buffer and spring works just fine. I think it's a fine platform. I've had a PSA PA10 for about a year now. Put a Syrac adjustable gas block on it and eats about anything and shoots 1 MOA with a 3-9 scope. Mine has been a good rifle. |
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Bump.
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The nine most terrifying words in the English language are, 'I'm from the government and I'm here to help.' - Ronald Reagan
Official Arfcom Callsign - "Hot Sauce" |
Bump. 8/1/2107
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OP, you need to add Windham Weaponry.
They use DPMS/SR25/PMag type mags. |
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Human rights don't have expiration dates.
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Bump for research. Well done OP. Great information here.
If a guy was looking at an 80% build, is there are thread that covers this? |
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Teener Crew 4 Lyfe
Proud Member of Team Ranstad! |
I've been looking at the Palmetto State Armory .308 uppers that they have been marking down. I have an 80% lower made by 80% Arms. One of my friends just ordered one of the 18" PSA uppers and let me borrow it to see how it fit on my lower. I can confirm that the PSA .308 upper will NOT fit onto an 80% Arms lower. The charging handle sits a bit too low and hangs up on the part of the lower receiver that the buffer tube screws into.
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Deep behind enemy lines.
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Bump for 2018.
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The nine most terrifying words in the English language are, 'I'm from the government and I'm here to help.' - Ronald Reagan
Official Arfcom Callsign - "Hot Sauce" |
That gave me a head ache.... Someone should weed through that and cut the wheat from the chaff.
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So I have kind of a doozy of a question (or two). I’m building an AR10 with a Zev matched receiver set - and a unicorn barrel. I scored a brand new Warsport (yes I know they’re out of business, ZRODelta is selling old inventory) 16” barrel. Rifle length gas.
I’m eventually planning on getting a suppressor for it; so it’ll have an adjustable gas block. But I’m lost on what a proper buffer weight should be. I’m planning on putting a PWS enhanced buffer tube on it. Would a geisselle braided buffer spring work with a .308 carbine buffer? And if so, H3? Or heavier? Also, if anyone knows, how to tell/measure the barrel extension pattern? I *thnk* it’s DPMS pattern and I should be good with a standard BCG but the barrel came with no info and I don’t know how to tell by just looking at it. I’m assuming I should headspace it as well. Any help appreciated. I can post pictures of the parts later if anyone wants to see. |
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I don't think there is much difference in bolts/BCGs.
Here is a past thread; BCGs and Stuf Like That There Here's another thread worth wading through; MEGA (Now ZEV) Upper on ArmaLite B Lower I'm going to go back out on this limb as say a lot of the "this won't fit, that won't fit" is bunk. There's two basic receiver designs, they are incompatible with each other for obvious reasons. ....and here is my standard caveat; Be careful. Be safe. Know what you are doing. Check head space. A set of GO/NO GO gauges and some judicious measuring before substituting parts is called for. Your mileage may vary. Subject to license, dealer prep and destination fees. No animals were harmed during the filming of this episode. Should you develop an erection lasting longer than four hours seek immediate medical attention. View Quote |
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So....
I'd like to get a .308 AR-10 as god and eugene stoner intended. But I see that there are tons of different incompatible AR-10 patterns. For example, I really like the look of the S&W M&P 10 SPORT Optics Ready; but I have read that the S&Ws have some rather proprietary parts designs and such in that something breaks, you're SOL with S&W product support, whereas with other brands, you can at least fall back onto stuff made for that pattern. So which pattern is the most compatible currently? |
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Go DPMS pattern and don’t look back. Plenty of parts to get you what you want.
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Proud Member of Team Ranstad
NRA Life Member USPSA Member |
Aero Precision M5's use a different size mag catch and mag release button. The catch has less threads on it, and the button is about double the size of a typical AR-15 mag release button. From what I've read, you can use an "Armalite" AR-10 mag catch and, with it's extra threads, that will let you use standard AR-15 sized mag release buttons, or extended ones... I have not tried this myself though.
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What pattern lower is the DD5 closest to? Can a DD5 run a normal length carbine buffer with an A5 extension? If so, would a rifle spring work?
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Originally Posted By Dimicron: Aero Precision M5's use a different size mag catch and mag release button. The catch has less threads on it, and the button is about double the size of a typical AR-15 mag release button. From what I've read, you can use an "Armalite" AR-10 mag catch and, with it's extra threads, that will let you use standard AR-15 sized mag release buttons, or extended ones... I have not tried this myself though. View Quote I scanned this thread and didn't see what I was looking for, so I'll tell you what haunts me, beware the height of the Aero upper rail. I have an M5 Lower and upper receiver pair, but no hand guard was available, so I bought what I thought was a 308 hand guard, and the rail height didnt' match the M5 upper receiver. so the HG is fugly and doesn't match any contours, I realize that ultimately if I want every thing to line up, I need an Aero M5 unit, but untill those are readily available, The cheap brand I have now is about 1.5m or 60 thousands, or about 1/16th low. Tall rail height is required. Heed this warning, those who seek a matched rail height for M5 upper receivers. |
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I figured its best for me to ask this here. Please confirm the below.
DPMS Gen 1 is high profile. DPMS Gen 2 is low profile. I understand the handguard specifics now. The new thing that just threw me a curve ball is reading there is now difference between Gen 1 and Gen 2 when it comes to barrels, and BCGs. Is this the case? |
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Originally Posted By truedef: I figured its best for me to ask this here. Please confirm the below. DPMS Gen 1 is high profile. DPMS Gen 2 is low profile. I understand the handguard specifics now. The new thing that just threw me a curve ball is reading there is now difference between Gen 1 and Gen 2 when it comes to barrels, and BCGs. Is this the case? View Quote AR-15 centerline of bore to top of rail ~1.215" DPMS Gen 1 "low" centerline of bore to top of rail ~1.253" DPMS Gen 1 "high" centerline of bore to top of rail ~1.313" DPMS Target centerline of bore to top of rail ~1.638" ArmaLite AR-10 centerline of bore to top of rail ~1.318" DPMS GII is the same height as an AR-15 |
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Originally Posted By msgriff: AR-15 centerline of bore to top of rail ~1.215" DPMS Gen 1 "low" centerline of bore to top of rail ~1.253" DPMS Gen 1 "high" centerline of bore to top of rail ~1.313" DPMS Target centerline of bore to top of rail ~1.638" ArmaLite AR-10 centerline of bore to top of rail ~1.318" DPMS GII is the same height as an AR-15 View Quote Thank you for taking the time to chime in. All I know about my receiver is that it is a DPMS low profile. This darn PRI charging handle is now throwing Generations into the mix. I am still confused on these two: does not work on Rock River 308 or DPMS gen II 308's: https://www.opticsplanet.com/precision-reflex-308-gas-buster-charging-handle.html Handle will ONLY WORK ON DPMS G2 Rifles: https://www.opticsplanet.com/precision-reflex-dpms-g2-308-gas-buster-charging-handle.html |
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Originally Posted By truedef: Thank you for taking the time to chime in. All I know about my receiver is that it is a DPMS low profile. This darn PRI charging handle is now throwing Generations into the mix. I am still confused on these two: does not work on Rock River 308 or DPMS gen II 308's: https://www.opticsplanet.com/precision-reflex-308-gas-buster-charging-handle.html Handle will ONLY WORK ON DPMS G2 Rifles: https://www.opticsplanet.com/precision-reflex-dpms-g2-308-gas-buster-charging-handle.html View Quote View All Quotes View All Quotes Originally Posted By truedef: Originally Posted By msgriff: AR-15 centerline of bore to top of rail ~1.215" DPMS Gen 1 "low" centerline of bore to top of rail ~1.253" DPMS Gen 1 "high" centerline of bore to top of rail ~1.313" DPMS Target centerline of bore to top of rail ~1.638" ArmaLite AR-10 centerline of bore to top of rail ~1.318" DPMS GII is the same height as an AR-15 Thank you for taking the time to chime in. All I know about my receiver is that it is a DPMS low profile. This darn PRI charging handle is now throwing Generations into the mix. I am still confused on these two: does not work on Rock River 308 or DPMS gen II 308's: https://www.opticsplanet.com/precision-reflex-308-gas-buster-charging-handle.html Handle will ONLY WORK ON DPMS G2 Rifles: https://www.opticsplanet.com/precision-reflex-dpms-g2-308-gas-buster-charging-handle.html |
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The real confusion is determining the low and high profiles.
Did GEN 1 and GEN 2 have both high and low profiles? EDIT: @November5 Thank you! I placed my order with that one on a wild guess before reading your comment. |
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Under the Manufacturer section for Sig you can add the 716i TREAD series, 16" barrel, direct impingement.
Thank you for all the work in this FAQ, it's been most informative. |
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When a strong man armed keepeth his palace, his goods are in peace. Luke 11:21
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