The Robinson Armament XCR-M is the .308 Winchester/7.62x51mm variant of the XCR modular rifle platform. Using the same short-stroke gas piston action scaled for the larger cartridge, the XCR-M delivers full-power battle rifle performance in a design that converts between calibers including .308, .260 Rem, and 6.5 Creedmoor with barrel and bolt changes. The receiver is larger than the XCR-L and not cross-compatible. Type: Rifle Action: Semi-Automatic Caliber: 7.62x51mm NATO Capacity: 20 Year introduced: 2010, USA Weight: 108 oz Overall length: 37" Status: Active Intended use: precision, tactical, sporting