CMMG Barrel Sub-Assm 16.1inch M4 4140CM SBN 22LR

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