The Knight's Armament SR-25 EC (Enhanced Carbine) is the carbine variant of the legendary SR-25 precision semi-automatic rifle, featuring a 16-inch barrel and suppressor-ready muzzle. Eugene Stoner designed the SR-25 as a precision semi-automatic sniper rifle that shares 60% parts commonality with M16/AR-15 pattern weapons. The EC configuration adds a free-floating URX rail and improved ergonomics over earlier SR-25 variants. Type: Rifle Action: Semi-Automatic Caliber: 7.62x51mm NATO Capacity: 20 Year introduced: 2012, USA Weight: 124 oz Overall length: 37.5" Status: Active Intended use: Designated Marksman / Law Enforcement