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1/25/2018 7:38:29 AM
Posted: 7/13/2003 8:03:23 AM EST
I have an AR15 rifle upper with a barrel marked "C MP B". Using Biggerhammer.net, I believe it's a Colt barrel that has been "magnflux" tested, but I haven't determined what the "B" means. Can anyone help me out?
Link Posted: 7/13/2003 10:07:49 AM EST
'B' means bore is chrome lined.
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