Factory New & unfired SIG-SAUER SIG-556 COMMANDO Carbine. Features the same high-performance two position adjustable gas piston operating rod system engineered by SIG’s sister company Swiss Arms and marries it to a trigger housing that not only cuts the rifle’s weight by a pound but is designed to accept standard AR mags. 16” military grade cold hammer forged bbl, chambered in 5.56mm NATO, with a twist rate of 1 in 7”. The high performance flash suppressor provides enhanced flash reduction and features an ACME type thread for compatibility with select industry sound suppression devices. The flash suppressor retains a standard .5 x 28 TPI thread pattern, ensuring compatibility with after-market accessories. Sig 551 forearm. The Picatinny rail equipped receiver is made of high strength carbon steel with a durable wear-resistant Nitron X rifle finish. The rifle comes standard with the flip up combat front and rear sight system. The trigger housing is machined from an aircraft grade aluminum alloy forging with a hard-coat anodized finish designed to survive extreme conditions. The rifle comes equipped with a smooth two-stage trigger, ambi safety and is designed to accept standard AR magazines. Features the FOLDING MAGPUL CTR Carbine Buttstock. This buttstock is adjustable for length of pull and features a unique locking mechanism that friction locks the stock to the receiver extension for zero movement. Caliber 5.56mm NATO. OA Length 37". Length w/Stock Collapsed 33.5". Sight Radius 21". Weight w/o Mag 7.8 lbs. Operating System Gas Operated, Rotating Bolt. Mfgr warranty.