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Posted: 11/26/2011 7:51:10 PM EDT
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I have had a difficult time finding good information on this build excepting the scant information on retroblackrifle. Right now, I have:
1-12 twist Colt C MP Chrome Bore barrel (mine will be 16" instead of 14.5") the a1 bird cage flash hider, correct CAR handguards a 604, round upper with Colt proof marks but no forward assist or forge code coupled to a flat slipring the correct trapdoor buttstock and a NDS-16a1 full fence lower. Questions: I assume this was a USAF carbine. Is it correct to have a no forge code upper. Also, what about the FSB. Did these have the flashing or were they smooth. The photo that I am modeling this carbine from is taken from the retroblackrifle webiste on the 652, see below. It seems to have a chrome bolt carrier? I know the USAF carbines have something of a mix-master, grab bag past. But then I see the 30 round magazine and wonder if this was more of an export weapon with various pieces from here and there. Any help is appreciated!  </a> Uploaded with ImageShack.us" />
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I'm not privy to any actual data, but I doubt the 652 was ever made in any quantity. Probably just another carbine variation they were flirting with.
Troops in the field discovered that the XM177 style carbines ran better with a rifle buffer, so Colt probably tested it out and took a photo. 
The pic shows a no-trap stock BTW. |
| Fixed stock carbines are my favorite set up. At first I thought they looked funny, then I threw a carbine upper on a rifle lower just to check the headspace and it amazed me how much better it felt to me. If you have a beard it won't catch in the stock either, and the rifle buffer is around the same weight as a 9mm, so it should increase reliability. Everthing sounds right to me except the 16" barrel, but I understand why a guy would use one. |
I found a photo of the Model 651 by another poster in the real deal photo thread, re-posted below. This is the only photo of the 651/652 I have seen in use. I assume that the rack number on the 651 means it was fielded in some capacity. I agree with the observations about the rifle length buffer and a carbine upper. I placed my SP1 carbine upper on a SP1 rifle lower and got the bug. It is a fun gun to shoot and super easy to move from place to place.
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Any more info from anyone on either the 651 or 652? |
I could be wrong, but IIRC, they were export only, which might explain the flat slip ring - not that I understand it, but the 630 was apparently an export gun as well, and the only real difference between it and an XM177E2 was the flat slip ring...as far as I can discern. Maybe Colt used up their supply of flat slip rings for export guns since the US military had changed the spec to delta rings? Just a thought. FWIW, I have a fixed stock on my A2 upper/early M4 build, and love it. I can't post pics here though. 
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