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Posted: 11/24/2018 9:49:10 AM EDT
[Last Edit: ARogueNinja]
This thread will be dedicated to builds and discussions of the FBI clones and thanks to Geissele for listening to the masses and releasing the much coveted rail. Parts lists will be updated as we go. Please keep it on topic and post pictures of your builds and "in the wild" photos.
     Barrel: Colt 11.5" barrels & others since there was already a mix of stuff out there between the different offices, prior to the upgrade starting. Lower: Colt/ some older DOJ contract RRA lowers, among others. Grip: ERGO/ Hogue/ A2 Upper: Most of the uppers appear to be Colt marked. Rail: Troy and Geissele, seems like the main colors for the MK4 rail are Black and OD, unsure of the others. Flash hider: A2 flashhiders/ Surefire/ KAC NT4 Optics: Aimpoint H1/T1s & H2/T2s are approved, along with the Daniel Defense mounts. The Sig Romeo4 red dot was also approved and is being used by some other federal agencies too. Spuhr mounts for Aimpoints for HRT guns. EOTech EXPS 3 & G33 Magnifier Sights: Troy BUIS/ Magpul MBUS Laser: L3 AN/ PEQ 15 Stock: CTRs Sling: VTAC 2 points/ Magpul MS Light: WMLs/ Surefire Scout More info here: Industry Thread Originally Posted By mbpike: Originally Posted By GS5414: Alright homies. I'm going to drop some knowledge, and then ghost. Folks generally got a handle on the right parts. Right now, the FBI has stopped throwing out their T2s/Spuhr mounts because folks are starting to regret replacing them with the ROMEO RDS. Things aren't holding up to abuse and long life. Who knew. You'll see the Aimpoint make a comeback. Also, nobody in this thread has the right gas block. Geissele gas blocks are used on the FBI guns, but they are port restricted gas blocks, as in the ports aren't drilled all the way out. We used them in the USMC for some of the souped up M4s, at both 0.072" restricted for 14.5" guns (a bit too small), and 0.068" restricted for 10.3" guns. The FBI uses 0.067" restricted blocks. I think I have one of them stashed away that I never managed to use - might take a photo of it if I can find it. They do a good job keeping gas port erosion from affecting function of the guns as the barrels burn out. Keeps carrier speeds lower, recoil is a bit softer. They are not sold commercially, or even talked about for that matter. If you want the same function, take a G block and thread it for a BRT Micro Tune 0.067" port insert. I'm out. S/F Lets get this added to the OP. Originally Posted By elucidate: Not a clone. Large regional SWAT. Skinny commando barrel. Originally Posted By elucidate: Indeed. When I said 'not a clone' by that I meant it's a picture of a real upper, sat on a desk in a large regional FBI training facility, not something I made at home. Originally Posted By 3ACR_Scout: Originally Posted By AZgunner: I haven't decided if I'm doing the clone correct green rail, or if I'll do the same setup but in all black. It depends on where I'm at in a few months. If I need to give my current rifle back and use the FBI clone on duty, I need to do it in black, as only all black color schemes are currently authorized. A black rifle can be completely clone correct, it would just represent a regular agent's rifle, not HRT or Regional SWAT. This thread started as a result of the interest in the green Geissele Mk4 handguards that showed up on Regional SWAT rifles, but all four Geissele colors are in use by the FBI. People are just (understandably) a bit fixated on the green ones because they look great. That's led to what a lot of people are doing, which is combining the features of the HRT and SWAT rifles into a mixed clone (SWAT green handguard and CTR stock, HRT heavy barrel, and Spuhr HRT Aimpoint mount). I think it would be great if @ARogueNinja could update the original post to reflect the four FBI variants that are out there (these details are incomplete and could be a little off): HRT: DDC Mk4 handguard, 11.5" Colt HRT heavy barrel, Aimpoint T-2 on Spuhr mount (not sure about the stock), black or FDE(?) CTR or Colt stock Regional SWAT: OD Green Mk4 handguard, 11.5" Colt LE6933 government profile barrel, Aimpoint T-2 on Daniel Defense mount, OD green CTR or Colt stock Vehicle Teams: Grey Mk4 handguard, 11.5" Colt LE6933 government profile barrel, Sig Romeo, FAB Defense PTK AFG, Maxim Defense collapsible stock https://www.ar15.com/media/mediaFiles/1182/green___grey_M4_carbines_jpg-1584398.JPG Field Agent: Black Mk4 handguard, 11.5" Colt LE6933 government profile barrel, Aimpoint T-2 on Daniel Defense mount or Sig Romeo, black CTR or Colt stock I think this is a grey Mk4 issued to hrt4me but is (I believe) representative of the standard agent rifle configuration. I don't recall seeing any photos in this thread of a regular agent's carbine: https://i.imgur.com/A6UVttH.jpg |
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Posted: 1/15/2019 8:17:17 PM EDT
[#1]
A forged lower is a forged lower, so long as it's in spec.
Unless you are in a clone thread, in which case...it isn't. 
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Posted: 1/15/2019 8:43:07 PM EDT
[#2]
Quote HistoryOriginally Posted By michaelwesten:
I got my Colt Cerro Forge Upper for $110, they’re out there you just have to be willing to wait and hunt for a bit.... it is cloning after all Back to the topic at hand URX Mafia FBI MK4 
https://www.AR15.Com/media/mediaFiles/453805/39E165F9-B234-4039-8B54-A6DC0C61486B_jpeg-778907.JPG
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Posted: 1/15/2019 10:32:08 PM EDT
[Last Edit: michaelwesten]
[#3]
Quote HistoryOriginally Posted By carterbrunelle: That’s a good looking front buis 
It was a gift!! I won it on IG from a wonderful group of people in TEXAS |
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Posted: 1/15/2019 11:24:37 PM EDT
[#4]
Quote HistoryOriginally Posted By michaelwesten:
I got my Colt Cerro Forge Upper for $110, they’re out there you just have to be willing to wait and hunt for a bit.... it is cloning after all Back to the topic at hand URX Mafia FBI MK4
https://www.AR15.Com/media/mediaFiles/453805/39E165F9-B234-4039-8B54-A6DC0C61486B_jpeg-778907.JPG |
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Posted: 1/15/2019 11:55:01 PM EDT
[#5]
Quote HistoryOriginally Posted By sanman28:
Clean. Love it. Quote HistoryOriginally Posted By sanman28:
Originally Posted By Proto3:
Starting to come together. Waiting on the T2 and geissele mount. https://www.AR15.Com/media/mediaFiles/378839/1EDDCF29-363C-4FC9-B2AA-A9FDD26539C0_jpeg-806917.JPG https://www.AR15.Com/media/mediaFiles/378839/53C8E9BA-C0B5-4B6B-9A4D-D2661C746C4A_jpeg-806918.JPG Once PSA releases their M4A1 clone lower, I'll be form 1-ing that and switching it out with the PSA poop gremlim lower which is currently on it. |
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Posted: 1/16/2019 12:02:08 AM EDT
[#6]
Quote HistoryOriginally Posted By Proto3:
Once PSA releases their M4A1 clone lower, I'll be form 1-ing that and switching it out with the PSA poop gremlim lower which is currently on it. |
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Posted: 1/16/2019 12:08:24 AM EDT
[#7]
Quote HistoryOriginally Posted By Brockoli1010: PSA M4A1 clone lower? What’s the deal with this? I tried to consult Mr. Google but it’s not turning up much. I assume they can’t use the logo but are they going to mimic everything else?  Attached File |
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Posted: 1/16/2019 12:21:22 AM EDT
[#8]
Quote HistoryOriginally Posted By Proto3: This is what is will look like. Follow this thread and you can see all of the cool/goofy lowers they are releasing all because one customer tried to crap on their business. https://www.AR15.Com/media/mediaFiles/378839/Screen_Shot_2019-01-15_at_11_07_14_PM_png-809409.JPG |
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Posted: 1/16/2019 12:27:11 AM EDT
[#9]
The pre order is done for the PSA clone lowers. So, the people who put in for them should get an email and get the first grab at them. To date, all of their new lowers that have come from the GD thread have been limited runs. But who knows how many they will end up with on this one.
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Posted: 1/16/2019 12:59:38 AM EDT
[#10]
Quote HistoryOriginally Posted By Proto3:
This is what is will look like. Follow this thread and you can see all of the cool/goofy lowers they are releasing all because one customer tried to crap on their business. https://www.AR15.Com/media/mediaFiles/378839/Screen_Shot_2019-01-15_at_11_07_14_PM_png-809409.JPG |
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AL, USA
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Posted: 1/16/2019 9:15:03 AM EDT
[#11]
What’s the best place to purchase KAC BUIS? Will the micro 200-600 rear work with the 99051?
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Posted: 1/16/2019 11:42:13 AM EDT
[#12]
Quote HistoryOriginally Posted By under9:
What’s the best place to purchase KAC BUIS? Will the micro 200-600 rear work with the 99051? |
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AL, USA
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Posted: 1/16/2019 6:05:08 PM EDT
[#13]
Quote HistoryOriginally Posted By Tigwelder1971:
The EE, or Ebay. |
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Posted: 1/16/2019 7:42:25 PM EDT
[#14]
Quote HistoryOriginally Posted By under9: Thanks - will the rear micro work with the 99051? @MILSPEC556??? (This guy will know).
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Posted: 1/16/2019 7:55:03 PM EDT
[#15]
Quote HistoryOriginally Posted By Tigwelder1971:
I believe that both KAC rears have the same optical axis height and will cowitness with the front folding. (Same plane). @MILSPEC556??? (This guy will know). Quote HistoryOriginally Posted By Tigwelder1971:
Originally Posted By under9: Thanks - will the rear micro work with the 99051? @MILSPEC556??? (This guy will know). |
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Posted: 1/16/2019 7:56:42 PM EDT
[#16]
Quote HistoryOriginally Posted By MILSPEC556:
Yep. Same plane Quote HistoryOriginally Posted By MILSPEC556:
Originally Posted By Tigwelder1971:
Originally Posted By under9: Thanks - will the rear micro work with the 99051? @MILSPEC556??? (This guy will know).
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AL, USA
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Posted: 1/16/2019 10:27:42 PM EDT
[#17]
Quote HistoryOriginally Posted By MILSPEC556:
Yep. Same plane Quote HistoryOriginally Posted By MILSPEC556:
Originally Posted By Tigwelder1971:
Originally Posted By under9: Thanks - will the rear micro work with the 99051? @MILSPEC556??? (This guy will know). |
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Posted: 1/18/2019 11:09:59 AM EDT
[#18]
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Posted: 1/18/2019 11:23:28 AM EDT
[#19]
I emailed a while back to the guy @ PSA for a preorder but never heard back regarding the lower...
Hope I'm on that list. I kind of lost track of that and forgot. |
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Posted: 1/18/2019 5:40:28 PM EDT
[Last Edit: michaelwesten]
[#20]
Just got my Virgin Colt FBI HRT Barrel in today. Date Coded 02/16
As soon as I got home I mocked up the Upper just to take a peek at what she’ll look like 
Still making the decision of whether or not to stay with the KAC QDC Flash Eliminator or throw a First Generation MAMS on there.... super happy how this is turning out though |
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CT, USA
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Posted: 1/18/2019 8:14:16 PM EDT
[#21]
are the BUIS visible at all through the high optic mounts?
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Posted: 1/18/2019 8:28:03 PM EDT
[#22]
Quote HistoryOriginally Posted By Mikehikes:
are the BUIS visible at all through the high optic mounts? I don’t see it as an issue when you’re running a quality Red Dot/Holographic Optic |
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Posted: 1/18/2019 8:59:49 PM EDT
[#23]
Quote HistoryOriginally Posted By michaelwesten:
Just got my Virgin Colt FBI HRT Barrel in today. Date Coded 02/16 As soon as I got home I mocked up the Upper just to take a peek at what she’ll look like
https://i.imgur.com/e6ICQcl.jpg Still making the decision of whether or not to stay with the KAC QDC Flash Eliminator or throw a First Generation MAMS on there.... super happy how this is turning out though 
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Posted: 1/18/2019 10:42:48 PM EDT
[#24]
Quote HistoryOriginally Posted By HD2006: Nice, I managed to snag a virgin Colt HRT barrel also. It’s a nice barrel. https://i.imgur.com/HKqGB3F.jpg https://i.imgur.com/ZcUkExv.jpg |
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Posted: 1/18/2019 10:56:56 PM EDT
[#25]
Man all these rifles are looking fantastic. Something about it is amazing. Excited to finish mine. These FBI clones > mk18/CQBR. So clean and much more logical than a 10.3.
Keep it up guys. I’ll join the party soon... |
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AL, USA
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Posted: 1/19/2019 12:09:01 AM EDT
[Last Edit: under9]
[#26]
Quote HistoryOriginally Posted By michaelwesten:
Just got my Virgin Colt FBI HRT Barrel in today. Date Coded 02/16 As soon as I got home I mocked up the Upper just to take a peek at what she’ll look like
https://i.imgur.com/e6ICQcl.jpg Still making the decision of whether or not to stay with the KAC QDC Flash Eliminator or throw a First Generation MAMS on there.... super happy how this is turning out though |
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Posted: 1/19/2019 12:19:14 AM EDT
[#27]
Quote HistoryOriginally Posted By JohnMH92:
Man all these rifles are looking fantastic. Something about it is amazing. Excited to finish mine. These FBI clones > mk18/CQBR. So clean and much more logical than a 10.3. Keep it up guys. I’ll join the party soon... |
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Posted: 1/19/2019 12:42:00 AM EDT
[#28]
Quote HistoryOriginally Posted By under9: Is you rear BUIS the KAC micro? |
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Posted: 1/19/2019 12:49:48 AM EDT
[#29]
Quote HistoryOriginally Posted By wissota4:
Wait... what??? |
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Posted: 1/19/2019 12:52:21 AM EDT
[#30]
Quote HistoryOriginally Posted By cjwwd2:
Was your G gas block a pain to get on the HRT barrel like mine? Quote HistoryOriginally Posted By cjwwd2:
Originally Posted By HD2006: Nice, I managed to snag a virgin Colt HRT barrel also. It’s a nice barrel. https://i.imgur.com/HKqGB3F.jpg https://i.imgur.com/ZcUkExv.jpg |
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Posted: 1/19/2019 12:58:10 AM EDT
[#31]
Quote HistoryOriginally Posted By JohnMH92:
Man all these rifles are looking fantastic. Something about it is amazing. Excited to finish mine. These FBI clones > mk18/CQBR. So clean and much more logical than a 10.3. Keep it up guys. I’ll join the party soon... 
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Posted: 1/19/2019 1:51:19 AM EDT
[#32]
Quote HistoryOriginally Posted By JohnMH92:
Man all these rifles are looking fantastic. Something about it is amazing. Excited to finish mine. These FBI clones > mk18/CQBR. So clean and much more logical than a 10.3. Keep it up guys. I’ll join the party soon... |
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Posted: 1/19/2019 3:33:52 AM EDT
[#33]
Quote HistoryOriginally Posted By J_MONEY: I don't know about that. I literally have all the parts to complete an FBI build (FBI rail, Colt upper, Colt barrel, Troy BUIS, Aimpoint T1 on a DD mount, etc.), but still don't know if I really want to. When I was piecing together my MK18's, I couldn't wait to build them. I just lost interest in this build. |
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Posted: 1/19/2019 8:24:18 PM EDT
[#34]
Quote HistoryOriginally Posted By JohnMH92: To each their own! I guess I just like how 11.5’s feel compared to 10.3’s
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OR, USA
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Posted: 1/19/2019 8:56:03 PM EDT
[#35]
Quote HistoryOriginally Posted By michaelwesten: I myself am in the 11.5 > 10.3 group. I’ve just liked the way they looked and shot better... imo nothing looks sexier than an 11.5” with a mid length URX (II or 3.1) |
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MO, USA
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Posted: 1/19/2019 9:08:34 PM EDT
[#36]
Quote HistoryOriginally Posted By akrox: Lol, I swapped my URX II out in favor of the Mk4. The KAC gas block rubbed/interfered with the heat shield and it always bothered me, and no mechanical anti rotation. But, it was sexy. 
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Posted: 1/19/2019 9:21:05 PM EDT
[Last Edit: michaelwesten]
[#37]
Quote HistoryOriginally Posted By BNW:
Do what I'm doing- one FBI barrel with a URX II and one with a Mk4  Attached FileThe KAC CQB Gen III Clone was my first experience with the FBI HRT Barrel. I liked it so much that I had to grab another and since I sold myself on an FBI Clone as soon these rails came out I had to get it done.... It’s damn near impossible to pick a favorite between my stable lol I love them all for different reasons... just wish I had a KAC QDC/CQB to run with all of them. It’s about the only thing I’m missing atm... 11.5” is the ideal length for me. I fell in love after getting my SR-16. Its hard to go with any other barrel length in a 5.56.... unless it’s a Dimpled 14.5”
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MO, USA
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Posted: 1/19/2019 10:57:07 PM EDT
[#38]
Hell yeah! Nice uppers
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NJ, USA
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Posted: 1/19/2019 11:08:01 PM EDT
[#39]
anyone know what upper they used? i have a keyhole cage code colt ... and the lower im using a aero, but im not sure if i should get a RRA or something else ...hm
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Posted: 1/19/2019 11:16:12 PM EDT
[Last Edit: michaelwesten]
[#40]
Originally Posted By BNW:
Hell yeah! Nice uppers
Can’t wait to shoot this FBI Upper... Originally Posted By RealFreakinNato:
anyone know what upper they used? i have a keyhole cage code colt ... and the lower im using a aero, but im not sure if i should get a RRA or something else ...hm But if they were any newer production uppers coming in they would most likely be getting a Cage Code Upper from either forge I would believe (Cerro Forge or Brass Aluminum Forge) |
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Posted: 1/20/2019 12:03:39 PM EDT
[#41]
More money to spend now. Gotta add some of those KAC rail panels to mine.
Is no one painting their barrel nut and gas block? |
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Posted: 1/20/2019 12:07:37 PM EDT
[#42]
Quote HistoryOriginally Posted By Gamblinman:
Is no one painting their barrel nut and gas block? |
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Posted: 1/20/2019 12:08:44 PM EDT
[Last Edit: C6H12O6]
[#43]
Quote HistoryOriginally Posted By Gamblinman:
More money to spend now. Gotta add some of those KAC rail panels to mine. Is no one painting their barrel nut and gas block? Never thought of painting the barrel nut until I assembled it and noticed it’s kinda bright. So yeah I was thinking of it. |
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Posted: 1/20/2019 12:26:14 PM EDT
[#44]
Depending on the color of the barrel nut and rail, I do too. Trouble is the wide variant of colors from both manufacturers. I just shaved my FSB and painted both.
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Posted: 1/20/2019 2:07:49 PM EDT
[#45]
Quote HistoryOriginally Posted By Gamblinman:
More money to spend now. Gotta add some of those KAC rail panels to mine. Is no one painting their barrel nut and gas block? Do it! The KAC Panels are so comfortable...I’m one of those that likes the contrast on the barrel nut and gas block. Plus I was thinking it’ll look good when I finally decide to throw a SR-16 Sandcutter in there, which will most likely happen... |
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Posted: 1/20/2019 8:16:11 PM EDT
[Last Edit: kells81]
[#46]
Been working on the house so haven't had much time. I did find time to catch a OD SOPMOD in stock and changed the black out for green. Stripped a screw on my MRO mount so I guess I need to pony up and go ahead and get a Larue MRO mount inbound. Also ordered the stuff to build a Form 1 Suppressor for this using the Dead Air mounting systems. Hopefully the Feds get back to work and can get that on the road because this bitch is LOUD!
Also managed to get hands on a FDE SOPMOD. I am thinking about doing a 9mm PCC SBR build with the FDE setup using one of the AE Colt 9mm Upper/Lowers they sold a while back . 
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Posted: 1/20/2019 8:18:23 PM EDT
[#47]
Quote HistoryOriginally Posted By michaelwesten: Do it! The KAC Panels are so comfortable...I’m one of those that likes the contrast on the barrel nut and gas block. Plus I was thinking it’ll look good when I finally decide to throw a SR-16 Sandcutter in there, which will most likely happen... |
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Posted: 1/20/2019 8:48:45 PM EDT
[Last Edit: michaelwesten]
[#48]
Quote HistoryOriginally Posted By kells81:
Been working on the house so haven't had much time. I did find time to catch a OD SOPMOD in stock and changed the black out for green. Stripped a screw on my MRO mount so I guess I need to pony up and go ahead and get a Larue MRO mount inbound. Also ordered the stuff to build a Form 1 Suppressor for this using the Dead Air mounting systems. Hopefully the Feds get back to work and can get that on the road because this bitch is LOUD!
Also managed to get hands on a FDE SOPMOD. I am thinking about doing a 9mm PCC SBR build with the FDE setup using one of the AE Colt 9mm Upper/Lowers they sold a while back . https://www.AR15.Com/media/mediaFiles/43495/IMG_3274_JPG-815227.jpg https://www.AR15.Com/media/mediaFiles/43495/IMG_2192_JPG-815228.jpg The Magpul are nice I just love anything KAC and any reason to make my first non-KAC MLOK Rail a little more URX always helps... I’m having second thoughts about selling my second OD Green FBI MK4 - really thinking about getting a MOD 2 CQB and just throwing the MK4 on it... |
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MO, USA
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Posted: 1/20/2019 10:29:49 PM EDT
[Last Edit: JSchell1309]
[#49]
If any of you guys are looking for Magpul ODG mags I just found a place that has a small pile of both window and non-window.
I ordered my handful, so have at it, animals. MAG571ODG Magpul Non-Window - 554 in stock MAG570ODG Magpul Windowed - 693 in stock |
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Posted: 1/20/2019 11:07:51 PM EDT
[#50]
Quote HistoryOriginally Posted By JSchell1309:
If any of you guys are looking for Magpul ODG mags I just found a place that has a small pile of both window and non-window. I ordered my handful, so have at it, animals. MAG571ODG Magpul Non-Window - 554 in stock MAG570ODG Magpul Windowed - 693 in stock |
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