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Just ordered a bolt and barrel combo as I have some stripper uppers laying around doing nothing. Anyone have any real issues with ejection on a standard reciever? I know they recommend a oversized ejection port for best results. Just looking to do a cheap upper with spare parts and to work with my pistol lower. Gonna get some endo mag conversions with some spare pmags.
Well just completed an 8.5" upper with a left over stripped reciever, holosun 510 green reticle. Have some endomags and just need to get out to the range to run some rounds through it.
No personal experience yet, but I'd check the thread over on Brian Enos for info about that. Quite a few guys over there building PCCs with the guard system, and there is lots of good info over there. I do remember at least one person using a standard upper and not having issues, as long as it was the 9mm model, and not the 45. Once again no personal experience, but check over there for sure.
There was a decent length thread on ar15. Will look for the one on brian enos as I frequent that one as well.
Attachment 58965
Here it is all finished up. Plan to run some mags throug it after uspsa this sunday.
Interested to hear your thoughts on the Radial Delayed Bolt- does it/is it= softer shooting than the Blow Back guns?
A buddy has a blowback colt mag style. Will have to meet up with him to see if there is very much of a difference between the two. As of right now this will be my first 9mm AR and I haven't shot his yet.
There will be a bunch of pcc shooters tomorrow so I will see if I can try a blowback to see the difference.
Well didn't get to compare it to a blowback as the one pcc guy in my squad was having issues with both of his rifles, AR9 style and uzi. It ran good and the best I can explain the recoil impulse is kind of spongy. Not sharp but a little bouncy. May try an H buffer instead of standard and see if that helps with the bounce feel. Mags fed good. Did a quick stand up sight in at 20 yards. Definately see the appeal on these.
Are you using an A5 buffer system? Amphibian has done some great research on this RDB setup...
http://c3junkie.com/?page_id=538
Was using a standard buffer but threw an H weight in to see how it does tomorrow at the range. Have an H2 as well.
Ran it with the H buffer and sertled down pretty well. Locked back everytime. Ejection was slightly forward.
Have the upper and lower, maybe I can swing the bolt and barrel for Christmas. Looking forward to finally putting mine together. Thanks for posting about your experience!
Reference the spongy feeling, a Sprinco red spring and carbine or H buffer felt the best in mine.
Just finished my 10mm build last week and got to put some rounds through it today. Ran through 2 20rd mags without a hiccup. Angstadt Arms receiver set with the CMMG 8" 10mm barrel and BCA. I decided to just try it before making any modifications to the ejection port. It ran and ejected the cases just fine. The ejection port dimensions are .545 by 2". Buffer spring is a Sprinco extra power carbine spring and buffer is an Expo H2.
Didn't have much time and didn't do a side by side comparison with my 9mm but recoil felt very mild.
If you already have a 9mm AR15, can you just drop one of the CMMG radial delayed bolts in or is there more to it than that? What I'd really like to do is setup my M16 lower to run 9mm sometimes. I've been told that 9mm is tough on lowers. Would this special bolt alleviate that problem?
I'd be interested to hear about this as well.Quote:
Originally Posted by Bret
Moon
Need to get their barrel as well...Quote:
Originally Posted by Bret
So is that it, just the bolt and barrel are different from a regular blowback 9mm?
Most blowback 9s also like a very heavy buffer that is slightly longer as well. The guard bolt has an ejector like a regular ar15 so 9mm lowers or conversions have a fixed ejector that will interfere with the guard bolt.
I Just built a 9mm upper with the CMMG bolt and barrel. Everything but the bolt and barrel is standard at. I run it on a regular lower with a A5H2 system. Instead of a 9mm lower or conversion I use the endomag Conversion magazine. https://www.meanarms.com/products/detail/endomag-9mm
It has been 100% in the limited use I have given it so far
Bolt hold open mag changes pouches etc are the same as a 556 ar