AR Sponsor
Posted: 3/29/2010 10:04:38 PM EDT
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I recently got a Colt Canada/Diemaco AR upper. It is a retro style, and I noticed that the BCG looks a bit different. I've looked online, and it looks like a lot of the retro ARs/M16s seem to have this "older style" of BCG.
EX: My CMMG BCG VS The Diemaco: 
I am just wondering if there is any difference in terms of performance and why they changed? |
Early M16's (601's, 602's) and Air Force M16's (604's) didn't have the forward assist feature, therefore, the bolt carriers didn't have forward assist cuts. You have a carrier that came out of a rifle that wasn't equipped with forward assist, which means that it's not original to that upper. If you want your forward assist to function, you'll need a carrier with forward assist cuts. 
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