Spaniky73 Posted February 28, 2015 Report Share Posted February 28, 2015 (edited) What is the difference between barrels on LAR 8, dpms and alike? Edited February 28, 2015 by Spaniky73 Quote Link to comment Share on other sites More sharing options...
survivalshop Posted March 1, 2015 Report Share Posted March 1, 2015 (edited) As far as DPMS & AR 10 , its thread pitch , as far as the LAR 8 , not sure . Note : That's Barrel nut thread pitch . Edited March 2, 2015 by survivalshop Quote Link to comment Share on other sites More sharing options...
unforgiven Posted March 1, 2015 Report Share Posted March 1, 2015 I thought it was in the RRA barrel nut. Quote Link to comment Share on other sites More sharing options...
Spaniky73 Posted March 1, 2015 Author Report Share Posted March 1, 2015 The barrel nut only effects the receiver. Are the bolt locking lugs the same. Quote Link to comment Share on other sites More sharing options...
survivalshop Posted March 2, 2015 Report Share Posted March 2, 2015 I believe the DPMS AR & AR 10 are about the same , because some are using the barrels in ether platform they just have different threads on the Barrel nuts for the two different platforms . The relationship of the Lar 8 's locking lugs , no idea how they would mate up to the other two & I think the BCG of the LAR 8 is longer , but someone who owns or has owned one will have to say for sure . Quote Link to comment Share on other sites More sharing options...
98Z5V Posted March 3, 2015 Report Share Posted March 3, 2015 (edited) LAR 8 BCG is longer. Confirmed, by the longass charging handles, that are longer than DPMS and AR10 chargers handles (Same length for those two, and interchangeable). Something with the locking lugs and barrel extensions is different between the DPMS and AR10 stuff. Don't mix-n-match a DPMS bolt with an AR10 barrel - and the opposite. DPMS bolts will fit in the AR10 bolt carrier, and the AR10 bolts will fit in the DPMS carrier - so the bolt carriers are very, very similar, and will function in either platform. The bolt carriers. Not the bolts and barrel extensions. Match your BOLT and barrel extension (your barrel "brand"). Is that the perfect world? Nope. Can you run an AR10 barrel and complete bolt carrier group in your DPMS-based rifle (upper and lower receivers)? Hell yeah. And the opposite. RRA is the "weird AR..." <lmao> Only thing you can interchange in that bastard is Bushmaster BAR10 stuff... :banana: Edited March 3, 2015 by 98Z5V Quote Link to comment Share on other sites More sharing options...
Spaniky73 Posted March 3, 2015 Author Report Share Posted March 3, 2015 Found this on the JP rifles website - "JP Supermatch™ barrels in .308 Winchester/ 7.62x51 or .260 Remington are compatible with most AR-10 platforms except the Rock River LAR-8 or Bushmaster BAR-10. Due to the use of an FAL magazine, the extension piece on the barrels used in those rifles must be extensively modified to allow for feeding. Therefore, JP .308 and .260 barrels are not compatible with the RRA or BM rifles. However, our barrels may be modified to work with the LAR-8 or Bushmaster BAR-10 rifles." Anyone know what modifications are required? Quote Link to comment Share on other sites More sharing options...
Spaniky73 Posted March 4, 2015 Author Report Share Posted March 4, 2015 "The feed ramp on those rifles is different and the AR10/LR308 barrels with the double feed ramps won’t feed from your magazines. You need to modify the feed ramp to be like your existing barrel. Dave Cammack Engineering, Technical Support & Quality Control JP Enterprises, Inc" Got my answer Quote Link to comment Share on other sites More sharing options...
survivalshop Posted March 4, 2015 Report Share Posted March 4, 2015 So , you want to use a LAR 8 barrel on a AR10/LR308 Upper receiver or something like that ? Quote Link to comment Share on other sites More sharing options...
Spaniky73 Posted March 4, 2015 Author Report Share Posted March 4, 2015 I want to put another barrel into my LAR 8. Want to put in a 22"-24" fluted in with a built in brake. Quote Link to comment Share on other sites More sharing options...
Tripledeuce Posted March 4, 2015 Report Share Posted March 4, 2015 After carefull checking, I installed a DPMS 260 rem bbl on a RRA lar8 upper with NO problems! Headspace checked out, and metal mags took about 6 strokes with a fine file to make work! Got @200 rounds downrange now, with NO problems! Respectfully Terry Quote Link to comment Share on other sites More sharing options...
planeflyer21 Posted March 4, 2015 Report Share Posted March 4, 2015 (edited) After carefull checking, I installed a DPMS 260 rem bbl on a RRA lar8 upper with NO problems! Headspace checked out, and metal mags took about 6 strokes with a fine file to make work! Got @200 rounds downrange now, with NO problems! Respectfully Terry Thought I remembered someone switching out a barrel. No issue with the RRA bolt/barrel extension? Edited March 4, 2015 by planeflyer21 Quote Link to comment Share on other sites More sharing options...
Tripledeuce Posted March 4, 2015 Report Share Posted March 4, 2015 Gun runs fine. EVERYTHING was NEW RRA, except the bbl! Bolt fits the bbl extension just fine, headspace is correct, and the gun functions flawlesly! Respectfully Terry Quote Link to comment Share on other sites More sharing options...
Spaniky73 Posted March 4, 2015 Author Report Share Posted March 4, 2015 (edited) So I just found out that the locking lugs on AR 10 and DPMS barrels are the same as an RRA. So a RRA bolt SHOULD mate up with any aftermarket barrel. You just have to work the feed ramp. Now I need to find a barrel I like and get the funds together. Edited March 4, 2015 by Spaniky73 Quote Link to comment Share on other sites More sharing options...
planeflyer21 Posted March 5, 2015 Report Share Posted March 5, 2015 So I just found out that the locking lugs on AR 10 and DPMS barrels are the same as an RRA. So a RRA bolt SHOULD mate up with any aftermarket barrel. You just have to work the feed ramp. Now I need to find a barrel I like and get the funds together. Boy that ain't gonna stop RRA from yelling about their disclaimer "It may measure EXACTLY the same but it isn't! Don't mix and match! Buy only RRA!" Quote Link to comment Share on other sites More sharing options...
survivalshop Posted March 5, 2015 Report Share Posted March 5, 2015 You learn something new here every day . Quote Link to comment Share on other sites More sharing options...
happyhuntr Posted August 11, 2016 Report Share Posted August 11, 2016 I realize this is an older thread, Has anyone tried to install a RRA 308 barrel in a DPMS pattern upper receiver? Quote Link to comment Share on other sites More sharing options...
Spaniky73 Posted August 11, 2016 Author Report Share Posted August 11, 2016 This is the only difference I can find between a dmps barrel and a LAR 8. Some has a "v" ramp and a LAR8 had a rounded ramp. Quote Link to comment Share on other sites More sharing options...
Spaniky73 Posted August 11, 2016 Author Report Share Posted August 11, 2016 10 minutes ago, Spaniky73 said: It won't let me edit my post. Damn auto correct. I meant dpms not some. Quote Link to comment Share on other sites More sharing options...
Tripledeuce Posted August 11, 2016 Report Share Posted August 11, 2016 I have put several DPMS bbls on RRA uppers with NO problems! I am pretty sure you can go the other way. But have not done it, myself. Respectfully Terry Quote Link to comment Share on other sites More sharing options...
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