Knights Armament SR-15 Individual Weapon System with 16-inch barrel. Full-length URX rail system. Designed as complete system with KAC suppressor integration. SOCOM evaluated. Type: Rifle Action: Semi-Auto Caliber: 5.56 NATO Capacity: 30 Year introduced: 2010, USA Weight: 64 oz Overall length: 33.5" Status: Active Intended use: Duty, Defense, Special Purpose