The Knights Armament SR-25 ER Enhanced is a 7.62 NATO/.308 Win rifle featuring a 20” 5R cut rifled match grade alloy barrel with a 1:11 twist. The Barrel also features a target crown to maximize the accuracy of the barrel. Rifles includes the URX2 rail system with integrated flip-up sights. The SR-25 series are semi-automatic rifle featuring the URX (upper receiver extending) free floating barrel system, an ambidextrous control system and a two-stage match trigger. The SR-28 ER also comes with a Fixed stock and one magazine.