This is SIG SAUER's short-stroke piston AR rifle, model R516-16B-BPM. This rifle has a 16" barrel, flat-top receiver and gas block, with Magpul MOE (collapsable) stock and grip, SIG polymer hand guard, 1 AR magazine, lock, and SIG hard shell case. It does not come with sights or optics. It is in like new condition, with only 100 rounds fired through it. Very reliable and easy to shoot. There are two small scratches on the bottom of the magazine well. $950 Must be transferred through an FFL Buyer to pay FFL and any shipping charges.