About the BCM® Standard 12.5″ 300 BLACKOUT Complete Upper Receiver w/ QRF-10 Handguard
- Continuous taper barrel profile designed for optimal weight, balance, and performance.
- 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 (5/8×24).
Included with this complete upper:
- Includes QRF-10 Handguard
- Includes BCM® Comp Mod 1 – 762/300 BLK
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 H3 buffer with high velocity ammo. If running subsonic ammunition, it is recommended to run your suppressor and a carbine buffer. 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.
