CMMG Barrel Sub-Assm 16.1inch M4 4140CM SBN 22LR
Description Perfect for building your custom dedicated 22LR AR15 upper group. 16.1?? M4 Profile 4140 Chrome Moly Salt Bath Nitride Finish inside and out 1:16 Twist 22LR Sprorting Chamber Threaded 1/2-28 .750? Carbine length Journal
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