Knights Armament SR-15 E3 18-inch Light Precision Rifle variant. URX 4 M-LOK handguard. Enhanced E3 bolt. Built for designated marksman precision at mid-range. Type: Rifle Action: Semi-Auto Caliber: 5.56 NATO Capacity: 30 Year introduced: 2016, USA Weight: 68.8 oz Overall length: 36.5" Status: Active Intended use: Precision, Long-Range, Duty