All NFA Rules Apply
BCM® 300 Blackout Upper Receiver Groups
Continuous 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 KMR-A10 KeyMod Handguard.
Includes KMSM (KeyMod Sling Mount)
Includes BCM Comp Mod 1 - 762/300 BLK
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.
- Caliber: 300 Blackout
- Barrel Length: 12.5"
- Barrel Material: 11595E Spec Steel
- Barrel Finish: Manganese Phosphate (Mil-Spec A-A-59267)
- Bore & Chamber: Chrome Lined
- Weight: 2.5 lbs
- Twist Rate: 1:7
- Gas System: Pistol
- Muzzle Device: BCM Comp Mod 1 (762/300BLK)
- Muzzle Threads: 5/8x24
- Handguard: KMR-A10
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