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Posted: 2/10/2008 6:08:55 AM EDT
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I just picked up a Colt M4 upper in a trade. The upper reciever is correct (marked C AF and has a 4 above the gas tube), but I have questions about the BBL and FSB. The barrel is M4 profile, marked: C MP 5.56 NATO 1/9 FSB is marked: G7 I 1 (no F that I can see) Did Colt ever produce a 1/9 M4? Can anyone tell me what I have here? Thanks J. Prescott |
It's this rifle with a 1:9 twist barrel. |
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