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Posted: 6/8/2012 9:43:11 AM EDT
| Question regarding my 'new' (to me) Colt barrel: It is stamped C MP NATO 5.56 1/5, and I know what that means. On the top of the barrel near the upper receiver and gas tube is a C (O?). Does this signify that the chamber and/or barrel is chrome-lined? After some searching the answer is as ambiguous to me as ever. |
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http://www.biggerhammer.net/ar15/barrelsbolts/
I think you mean "1/7" rather than "1/5" (that's the twist rate, btw). |
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Quoted:
Yes, I did mean 1/7. Any idea what the C (could be an 'O') represents that is stamped on the top of the breech end of the barrel? I'm not real sure what it means specifically. However, it is a Colt proof mark. You might find more information at: http://www.ar15.com/forums/t_3_123/296919_USGI_Colt_Carbine_parts_variation_guide_Edition_IV.html Edit: According to the link cited above, the "O" indicates a chrome-lined chamber and bore. |
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