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Posted: 3/18/2006 2:31:37 PM EDT
I ran a search but was unable to find the answer. I have 2 barrels, one is marked C MP C and the other is marked C MP B. I assume the first C is for Colt and the MP is Magnetic Particle tested but Would the last C mean chrome Chamber and on the other barrel would the B mean chrome Bore? Thanks!
Link Posted: 3/18/2006 3:56:07 PM EDT
[Last Edit: 3/18/2006 3:57:14 PM EDT by Ekie]
Very close, the M stands for Magnetic particle, and the P stands for Proof.

USGI barrel markings are covered in detail here:

www.ar15.com/forums/topic.html?b=3&f=118&t=241681
Link Posted: 3/19/2006 7:08:21 AM EDT
Thank you!
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