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Posted: 4/27/2016 2:34:39 AM EDT
[#1]
Quoted:
I bought a 9mm upper w bc. I was told bc and upper were cmmg. The upper is clearly marked RRA. So now I'm wondering if I have RRA bc, or CMMG bc. I did not find any identifying markings. Are there any features, such as cut outs, ramping etc, that would I'D it as RRA or cmmg? In a blowback 9mm AR there is no bolt carrier, just a bolt. Terminology lesson only - no idea on if there are any specific markings on an RRA or CMMG 9mm bolt. |
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Posted: 4/27/2016 6:12:53 AM EDT
[#2]
RRA has a page showing the differences between their current bolts and the older non-ramped bolts. Hopefully, this will help a little.
RRA |
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Posted: 4/28/2016 1:42:59 AM EDT
[#3]
Ty for the helpful info.
Comparing the rra pdf to the pics in the discussion listed below, I believe I have a cmmg bolt https://www.ar15.com/archive/topic.html?b=3&f=15&t=550965 |
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