Rock River Arms' LAR-15 in 6.8 SPC II chamber — an updated chamber specification that improved feeding reliability over the original 6.8 SPC. RRA was an early adopter of 6.8 SPC when the cartridge was gaining traction as a potential M4 replacement in special operations units. Type: Rifle Action: Semi-Automatic Caliber: 6.8 SPC Capacity: 26 Year introduced: 2006, United States Weight: 100.8 oz Overall length: 32.5" Status: Active Intended use: Hunting, Law Enforcement, Home Defense