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TheFirearmsForum.com
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02-23-2003, 10:59 PM
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Advanced Senior Member
Join Date: Jan 2003
Location: Deep Piney Woods of East Texas
Posts: 5,116
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AR-15 Barrel Markings
Moskovskyya
Member Posts: 22 (12/23/01 8:13:03 pm) Reply | Edit | Del All AR black rifle question -------------------------------------------------------------------------------- I have an AR rifle with barrel markings C MP 5.56 NATO 1/7. does anyone know what the "MP" means? Thanks Tac401 Administrator Posts: 3092 (12/23/01 9:40:14 pm) Reply | Edit | Del ezSupporter Re: AR black rifle question -------------------------------------------------------------------------------- Mosk, All Colt barrels are marked that way, I don't remember the meaning of the MP but the NATO 1/7 means 1-turn in 7-inches regarding rifling in the barrel, the 1-in-7 is the nato standard for using the current issue 62-grain steel core bullet, most commercial AR's now come with a 1/9 barrel for more bullet stablization and to effectively fire most any .223 weight bullets. I'm sure someone will be here to give you the meaning of the MP and jar my memory lol! The Firearms Forum Vietnam Memories Bulletin Board Contact Administrator M4A3 Member Posts: 1 (1/16/02 9:19:36 pm) Reply | Edit | Del Re: AR black rifle question -------------------------------------------------------------------------------- MP stands for 'Magnetic Particle' non-destructive testing...for more detail on "black Rifle" stamping ID see the below: www.biggerhammer.net Edited by: bondai at: 1/16/02 11:28:27 pm |
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