Originally created for use in subsonic/suppressed applications .300 BLK has evolved into a very capable caliber available in a variety of subsonic and supersonic loadings. Whether it's hunting personal defense or target shooting this .300 BLK RESOLUTE Upper Group is just the thing to finish your next carbine build. This upper is designed to work with any standard AR15 lower. Available in six different Cerakote finishes all CMMG Upper Groups come complete with bolt carrier group and ZEROED accessories including: - ZEROED AR15 Polymer Dust Cover - ZEROED AR15 Ambi Charging Handle - ZEROED Muzzle Brake .308 - Platform: Mk4 - Caliber: .300 BLK - Operating System: Direct Impingement - Barrel Length: 16.1 - Barrel Twist: 1:7 - Barrel Contour: MT - Barrel Material: 4140CM SBN - Muzzle Device: CMMG ZEROED Muzzle Brake - Muzzle Thread: 5/8 x 24 - Gas Port Location: Carbine - Gas Block: 0.750 Non-Adjustable - Upper Receiver: Billet 6061 T6 Aluminum - Hand Guard: CMMG EML15 M-LOK - Finish: Cerakote Standard - Charging Handle: CMMG ZEROED Ambi - Weight: 4.1 lbs - Length: 25 Main Features Caliber: 300 ACC BLACKOUT Barrel Length: 16.1 Finish: Cerakote Standard Weight: 4.1 lbs Other Features Ar-15 Accessory: Y Barrel Contour: MT Barrel Finish: MATTE BLACK Barrel Length In Inches: 16.1 Barrel Material: STEEL Barrel Twist: 1:7 Caliber/Gauge: 300 BLK Charging Handle: CMMG ZEROED Ambi Color: Black Dimension: 3.45 X 4.80 X 31.35 Gas Block: 0.750 Non-Adjustable Gas Port Location: Carbine Hand Guard: CMMG EML15 M-LOK Height: 3.4500 Length: 31.3500 Muzzle Device: CMMG ZEROED Muzzle Brake Muzzle Thread: 5/8 x 24 Operating System: Direct Impingement Other Features: COMPLETE UPPER GROUP, Platform: Mk4 Rate Of Twist: 1:7" Upper Receiver: Billet 6061 T6 Aluminum Width: 4.8000 Part Number: 30B12BBAB UPC: 810097502420

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