BCM-MK2-URG-300BLK-9-MCMR-8 BCM® MK2 Standard 9"" 300 BLACKOUT Complete Upper Receiver Group w/ MCMR-8 Handguard

""This BCM upper assembly is purpose-built for performance in the 300 Blackout caliber, featuring a 9"""" barrel made from durable 11595E spec steel with a manganese phosphate finish for corrosion resistance. The barrel is chrome-lined for extended life and reliability, and it sports a 1:7 twist rate ideal for stabilizing a wide range of bullet weights, including subsonic loads. Weighing just 2.2 lbs, this upper is lightweight yet rugged, making it well-suited for short-barreled rifle (SBR) builds or AR pistols. It utilizes a pistol-length gas system for reliable cycling with both supersonic and subsonic ammunition. The BCM Comp Mod 1 muzzle device, threaded at 5/8x24, helps mitigate recoil and muzzle rise. Completing the package is the BCM MCMR-8 free-float M-LOK handguard, offering a stable platform for accessories while enhancing accuracy. ""