Standard Manufacturing SKO-12 Semi Automatic Shotgun SKO-12 – 12 Gauge – 3 Chamber (Accepts either 2-3/4 or 3 shells) – 18.5 4140 Steel Barrel – Threaded to Accept Chokes – 5 Round Detachable Magazine – Smooth and Reliable Gas Operating System – Large 22 Rail Mount for optics lasers and other accessories – 6 Position Adjustable Stock – Rail Mounting Point on Fore Grip for adding additional Magpul MOE Rails – AR Style Pistol Grip – AR Sporting Rifle Type Controls – Overall Length Extended 38 – Overall Weight without magazine 7lbs 10oz – Internal components Salt Bath Nitride Finish – Upper Receiver is machined from Solid Billet 7075 Aircraft Grade Aluminum – Lower Receiver is machined from a forging of 7075 Aircraft Grade Aluminum – Upper/Lowers feature a Mil-Spec Hard Coat Anodized Finish – Matte Black