The XCR comes in two models. The XCR-L and XCR-M. The XCR-L shoots many popular calibers such as 5.56, .300 BLK, 7.62x39, 6.8 SPC, 6.5 Grendel, and .224 Valkyrie. Caliber changes are very easy and take only minutes by switching out barrels, bolts, and magazines. The XCR-M shoots .308, .243, .260, 6.5mm and 6mm Creedmoor by simply changing the barrel. These firearms can be configured as pistols with a pistol cap or an arm brace, or as rifles with a folding/collapsing stock. Barrel lengths from 7.5” to 20” are available. These firearms feature a unique, ultra-smooth piston driven operating system which is closer to the design of an AK47 than a stoner AR15 or AR10 and results in more reliability and performance. Perhaps the most beloved feature of the XCRs is the placement of our ambidextrous manual controls which are not only intuitive but allow the operator to keep his eyes on the target at all times.