<p>Pistol chambered in .223/5.56 comes with a 7.5†Chrome Moly Vanadium Steel M4 contour barrel 1-7 twist, Pistol Gas Set Up, Forged Receivers, Magpul pistol grip, Anderson EXT Free Float, Anderson Low Profile Gas Block, pistol Buffer Tube machined to accept Sig Brace, Anderson Knight Stalker Flash Hider, Anderson’s proprietary 17-4 stainless steel match grade Trigger and Hammer, Standard Charging Handle, Ambi sling mount. Please note this rifle is available treated with our proprietary NO LUBE RF85 treatment as well as untreated. California Compliant SPECIFICATIONS & FEATURES Caliber : 5.56 / .223 Action : Semi-Automatic Magazine Capacity : 1-10 round Overall Length : 24″ Extended Barrel Length : 7.5″ M4 Contour Rifling : 1-7 Twist Weight w/o Magazine : 4.9 lbs. Receiver : Forged 7075-T6 Front Sight : Optic Ready Butt Stock : N/A Grip : Magpul Forearm : Andersons EXT Free Float Flash Hider : Anderson Knight Stalker Gas Block : Low</p>