CMMG Banshee Fixed Ejector Upper Group Features The CMMG Banshee Fixed Ejector Upper Group continues CMMG s progression of radial delayed blowback technology this version adding a fixed ejector to bring new refinements to the original compact action platform. The 8 barrel machined from 4140CM steel with an SBN finish and an MT contour is built to handle sustained 9mm fire while keeping the overall package compact. CMMG s ZEROED Linear Compensator threads onto a 1/2x28 muzzle managing recoil impulse and muzzle rise for faster follow-up shots. A 1:10 twist rate is matched to common 9mm bullet weights for stable flight downrange and the whole upper is designed to work exclusively with CMMG MkGs Mk17 Mk4 Mk9 lowers or mil-spec AR15 lowers paired with 9mm conversion magazines. The upper receiver is machined from billet 6061 T6 aluminum and finished in Cerakote giving it a durable corrosion-resistant exterior in black. A CMMG EML7 M-LOK handguard wraps the barrel providing mounting space for lights grips or other accessories along the forend. Every Banshee Upper Group ships complete with a bolt carrier group and CMMG s ZEROED accessory package including a polymer dust cover and an ambidextrous AR15 charging handle so builders are not left sourcing small parts separately. At 3.0 lbs and 16.5 in length this upper gives 9mm AR builders a direct drop-on upgrade path for their existing lower. CMMG Banshee Fixed Ejector Upper Group Specifications Manufacturer: CMMG Model: Banshee Fixed Ejector Upper Group Compatible Hosts: Mk4 Mk9 Mk17 MkGs Mil-Spec AR15 Lowers Caliber: 9mm Barrel Length: 8 Barrel Material: 4140CM SBN Twist Rate: 1:10 Color: Black Upper Receiver Material: Billet 6061 T6 Aluminum Handguard: CMMG EML7 M-LOK Muzzle Device: CMMG ZEROED Linear Compensator Muzzle Thread: 1/2x28 Weight: 3.0 lbs Length: 16.5 Available At: GrabAGun