Diamondback firearms https://diamondbackfirearms.com/dbx-series/ SKU: DBX57BGFB UPC: 810035751750 MSRP: $1299.00 Operating System: Locked Breech, Dual Gas Piston Caliber: 5.7x28mm Frame: 7075 Aluminum, Hard Coat Anodized Handguard: 6061 Aluminum, Hard Coat Anodized, M-LOK Compatible Barrel Length: 8” Twist Rate: 1:9 RH Barrel Muzzle Threads: 1/2x28 RH Muzzle Device Included: DBX Muzzle Device Trigger: Standard AR15 Mil-Spec Grip: MagPul MOE K Action-Type: Semi-Auto Sights Included: NONE Magazine: 20 Round (FN Five-SeveN compatible) Brace: Rear Picatinny Mounted, Side Folding Overall Length (Brace Extended): 25.4” Overall Length (Brace Folded): 16.9” Overall Height: 7.3” Overall Width: 1.75” Weight (With Empty Magazine & Brace): 3.7lb Weight (With Empty Magazine & No Brace): 3.0lb