At just 10.5 this is the shortest 5.56mm upper group CMMG offers. Great for anyone looking to build an ultra-compact AR15 that’s lightweight and perfectly sized to go anywhere. This 5.56mm BANSHEE upper group is built on our Mk4 AR15 platform 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 Linear Compensator 5.56mm - Platform: Mk4 - Caliber: 5.56mm 5.56x45mm - Operating System: Direct Impingement - Barrel Length: 10.5 - Barrel Twist: 1:7 - Barrel Contour: MR - Barrel Material: 4140CM SBN - Muzzle Device: CMMG ZEROED Linear Compensator - Muzzle Thread: 1/2 x 28 - Gas Port Location: Carbine - Gas Block: 0.750 Non-Adjustable - Upper Receiver: Billet 6061 T6 Aluminum - Hand Guard: CMMG EML9 M-LOK - Finish: Cerakote Standard - Charging Handle: CMMG ZEROED Ambi - Weight: 3.5 lbs - Length: 18.8