Each barrel is individually magnetic particle tested. Barrels are engraved CMMG MPC 5.56 NATO 1/7. Each Upper is head spaced and test fired before shipping. Upper specific features are listed with the individual item. When selecting the gas piston operating system, it will override your choices for the bolt carrier and front sight/gas block.
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on Saturday, December 26th, 2009 at 2:47 pm and is filed under AR15 Uppers, Gun Parts, M4 Carbine Parts.
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