Caliper Posted March 8, 2014 Report Share Posted March 8, 2014 (edited) New member here, I've read some older threads on the forum where forum members have found that DPMS barrels will fit a RRA upper: Reading both threads, folks are reporting that the headspace is on the tight side using this combination (RRA bolt, DPMS barrel) has anyone compared the RRA to the DPMS bolt? I'm wondering if the DPMS bolt face is a hair deeper than RRA, or the locking lugs are a bit shorter or something. Is it possible that the DPMS bolt could fit in the RRA BCG? I'd help with measurements, but my LAR8 is still on order from Dec '12... Just looking ahead and know that I want to switch calibers but RRA has stopped selling anything but a .308 barrel (very distressing). Edited March 8, 2014 by Caliper Quote Link to comment Share on other sites More sharing options...
EasyEJL Posted March 10, 2014 Report Share Posted March 10, 2014 I believe its probably equivalent to the "using an AR10 barrel in a LR308", to where you need to match the barrel with the bolt. so for a RRA barrel, use an RRA bolt. The carrier should be the same on any of them. in the end if you are going to switch calibers if you get a custom / semi custom barrel made you can send in your bolt and they'll headspace to match. Quote Link to comment Share on other sites More sharing options...
600hpSBC Posted March 16, 2014 Report Share Posted March 16, 2014 Greetings all from Northern Illinois. I have been following this forum for a while and have been frustrated too with the lack of caliber options on the Rock River platform. I'm a retired Marine, hotrodder, shooter and wanting to help supplement my "budget" and was wondering: Would anyone pay $1000.00 for a full float tube equipped Rock River LAR 8 compatible upper with a 20" light contour 338 Federal barrel or a heavy contour 260 Remington? This would be complete with no bolt or charging handle. (Use your bolt, carrier and charging handle). Just wondering if there is a market after I get done testing. Lead times would apply of course due to the industrial base demand right now. Thanks for the time annd space! Y‘all be safe, Semper Fi! KBob Quote Link to comment Share on other sites More sharing options...
unforgiven Posted March 16, 2014 Report Share Posted March 16, 2014 Welcome from Indiana brother Bob and THANK YOU for you'r service.That is a interesting option,I am a RRA fan.So the same LAR-8 BCG would work with these 2 calibers??? Quote Link to comment Share on other sites More sharing options...
600hpSBC Posted March 16, 2014 Report Share Posted March 16, 2014 Thanks for all the support man. Anyhoo, thats the plan sir, to not have to buy a new bcg. Testing will have to bare this out, but my goal is 260, 308 and 338 with same bolt:-) Thus far, tolerance stack is agreeable, so going to test more and hope for the best! Quote Link to comment Share on other sites More sharing options...
unforgiven Posted March 16, 2014 Report Share Posted March 16, 2014 Good luck brother,keep us informed. <thumbsup> Quote Link to comment Share on other sites More sharing options...
98Z5V Posted March 21, 2014 Report Share Posted March 21, 2014 I believe its probably equivalent to the "using an AR10 barrel in a LR308", to where you need to match the barrel with the bolt. so for a RRA barrel, use an RRA bolt. The carrier should be the same on any of them. in the end if you are going to switch calibers if you get a custom / semi custom barrel made you can send in your bolt and they'll headspace to match. Rock River 308 bolt carriers are longer than DPMS/SR-25 bolt carriers / Armalite AR-10 carriers. That's one of the bigger differences in the 3 major patterns we deal with. Quote Link to comment Share on other sites More sharing options...
planeflyer21 Posted March 21, 2014 Report Share Posted March 21, 2014 True…the carrier is almost an inch longer. As are the charging handles. And why you need the 1" stock extension with the MagPul PRS. Quote Link to comment Share on other sites More sharing options...
EasyEJL Posted March 21, 2014 Report Share Posted March 21, 2014 crazy rock river arms bastards. I've never looked at one close as I didn't see the point :)Is the bolt still the same even if the carrier is bigger? Quote Link to comment Share on other sites More sharing options...
Tripledeuce Posted March 21, 2014 Report Share Posted March 21, 2014 Yes, the bolt is the same, just the carrier is different. Respectfully Terry Quote Link to comment Share on other sites More sharing options...
600hpSBC Posted November 11, 2014 Report Share Posted November 11, 2014 Update: For my three uppers (260, 308 and 338 Fed), I am using the same BCG. Anyone want one?:-) kineticpandm.com/products. Check it out:-) Quote Link to comment Share on other sites More sharing options...
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