The Knight's Armament SR-25 ECC (Enhanced Compact Carbine) is a refined version of the SR-25 EC with a new URX 4 rail system, improved barrel profile, and enhanced reliability features. The 16-inch barrel and carbine-length gas system provide reliable function across a wide range of ammunition and environmental conditions. Widely used by special operations units and federal law enforcement agencies. Type: Rifle Action: Semi-Automatic Caliber: 7.62x51mm NATO Capacity: 20 Year introduced: 2015, USA Weight: 126 oz Overall length: 37.5" Status: Active Intended use: Designated Marksman / Law Enforcement