About the BCM® Standard 9″ 300 BLACKOUT Complete Upper Receiver w/ KMR-A8 Handguard

Features:

• 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).

Whats included with this complete upper:

• KMR-A8 KeyMod™ Handguard.
• KMSM (KeyMod™ Sling Mount)
• One 3″ Picatinny Rail Section
• 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.