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Old January 13, 2013, 12:52 AM   #15
Senior Member
Join Date: July 10, 2005
Location: Portland, Or
Posts: 305
On colt rifles and a lot of others the "c" stands for chrome lined, and the "mp" is stands for magnetic particle tested.
Remington 700 BDL, Yugo M70B1 , Remington 870 wingmaster, Pre 64 Fn Mauser, WASR-10, Mossberg 500, S&W M&P-9, S&W M&P-9c, Mossberg 1500, AR-15 X2, Ruger 10/22, Kahr CW-9, Ruger P-89, Yugo SKS
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