Primary Weapons MK109 MOD 1-M 300BLK Upper Receiver 9.75" Barrel

The MK109 MOD 1-M 300BLK Upper Receiver delivers a compact and reliable configuration designed for AR-15 platforms chambered in .300 AAC Blackout. Featuring a long-stroke piston operating system, a free-floating M-LOK handguard, and a 9.75-inch barrel, this upper receiver provides dependable performance for a variety of applications, including suppressed use. :contentReference[oaicite:0]{index=0}

Product Features

• Designed for AR-15 platforms chambered in .300 AAC Blackout
• Features a long-stroke piston operating system for reliable cycling
• Includes a compact 9.75-inch barrel optimized for maneuverability
• Equipped with a free-floating M-LOK handguard for accessory compatibility
• Forged upper receiver provides durable construction
• Includes Radian Raptor ambidextrous charging handle
• Features a 1:8 twist rate for versatile projectile compatibility
• Includes Triad 30 compensator muzzle device