CMMG 18" Stainless Steel 5.56 Bull Barrel AR-15 Upper Receiver Free Floated 1:9 *FREE SHIPPING*

This CMMG complete upper receiver assembly is assembled with high quality parts & components. It will mount to any standard AR-15 lower receiver. Each complete upper is head spaced and test fired before leaving the factory. Barrels are engraved CMMG MPC 5.56 NATO 1:9. The upper is built off of CMMG's standard forged A3 receiver with M4 feed ramps. The barrel is our 4140 steel, Bull Barrel profile, 5.56mm chamber and bore and 1:9 twist ratio. The upper includes a low profile gas block and smooth free float tube forearm. Eleven degree recessed target crowned muzzle, this upper comes complete with charging handle & bolt carrier group. 

• Mfg. Part #: 55B3CDE
• Caliber: 5.56 NATO
• Forearm: Aluminum Free Float Tube
• Barrel Profile: Bull Barrel
• Barrel Length: 18"
• Barrel Material: 4140 Stainless Steel
• Barrel Twist: 1:9
• Bolt Carrier Group: Semi-auto
• Upper: Flat Top forged A3 receiver with M4 feed ramps
• Muzzle: Eleven degree recessed target crown
• Gas Block: Lo-profile