BCM AR-15 Upper Receiver 9" 300 BLACKOUT MCMR-8

BCG & Charging Handle NOT included
BCM® 300 Blackout Upper Receiver GroupsContinuous taper barrel profile designed for optimal weight, balance, and performance. Barrel profile fluted toward the rear near chamber area - Increases strength and heat dissipation.Tapered barrel profile out front, for easier maneuverability.No sharp handguard cap shoulder for improved barrel harmonics and improved accuracy.Muzzle threaded in standard 30 cal (5/8x24).Includes BCM Comp Mod 1 - 762/300 BLK
 
Features:

Caliber: 300 Blackout
Barrel Length: 9"
Barrel Material: 11595E Spec Steel
Barrel Finish: Manganese Phosphate (Mil-Spec A-A-59267)
Bore & Chamber: Chrome Lined
Weight: 2.2 lbs
Twist Rate: 1:7
Gas System: Pistol
Muzzle Device: BCM Comp Mod 1 (762/300BLK)
Muzzle Threads: 5/8x24
Handguard: MCMR-8

 
BCM has taken great care to ensure the best possible performance and interchangeability. However, due to the large operational range of 300 Blackout ammunition in the market place, BCM cannot guarantee function will all ammunition types in all conditions. These barrels were designed to run with a carbine buffer with subsonic ammo and a H3 buffer with high velocity ammo. Fine tuning may be required in limited instances based on ammo and buffer choices that work best for the desired application. BCM also recommends running the Crane O-ring (provided with all BCM Bolt Carrier Groups) over the extractor with 300 Blackout.