Kel-Tec SU-16B 5.56mm NATO 16in Matte Black Semi Automatic Modern Sporting Rifle - 10+1 Rounds - The SU-16 is a gas operated, semi-auto loading rifle chambered in 5.56mm NATO caliber. It is intended to be the perfect everyman's sport and utility rifle. It has a 1: 7in RH twist. Several features make the SU-16 a versatile sporting firearm, including a chrome-lined bore and chamber and integrated Picatinny rail for mounting different sight systems. The forend folds down to form a bipod for increased accuracy, the stock can store spare magazines, two 10-round magazines or one 20/30 round magazine will fit and the stock and trigger mechanism can be folded forward for added safety and to facilitate secure storage or carry under extreme conditions. Except for barrel and operating components, the SU-16 is made entirely of high impact reinforced polymer.