What many might consider the all-star of personal defense weapon calibers 5.7x28mm has cemented itself as a greatly effective round with less recoil than 5.56mm at closer ranges. With just a 5 barrel this ultra-compact BANSHEE will fit almost anywhere you need it. If you’re not fond of pistol magazine-fed ARs don’t worry this BANSHEE is built on our Mk4 AR15 platform which uses a standard AR15 lower receiver and our new and improved 5.7x28mm AR conversion mags. - Platform Mk4 - Caliber 5.7x28mm - Operating System Radial Delayed Blowback - Barrel Length 5 - Barrel Twist 1:9 - Barrel Contour MT - Barrel Material 4140CM SBN - Barrel Twist 1:9 - Muzzle Device CMMG ZEROED Linear Comp - Muzzle Thread 1/2 X 28 - Upper Receiver Billet 6061 T6 Aluminum - Lower Receiver Mk4 Forged 7075 T6 Aluminum - Hand Guard CMMG EML4 M-LOK - Finish Cerakote Standard - Charging Handle CMMG ZEROED Ambi - Pistol Grip CMMG ZEROED Pistol Grip - Buffer Type Carbine - Receiver Extension CMMG 6 Position Fastback Extension - Stock / Brace CMMG RipBrace - Trigger Type ZEROED Drop-In Single Stage - Trigger Guard CMMG ZEROED Trigger Guard - Safety Selector CMMG ZEROED 60/90 Degree - Magazine CMMG 32rd - Weight 4.6 lbs - Length 20.9