The Robinson Armament Co. XCR is a multi-caliber, gas piston weapon system developed by Robinson Armament Co. for U.S. Special Operations Command (SOCOM) to fill the requirements of the SOF Combat Assault Rifle,[5] or SCAR competition, but was disqualified on a technicality due to late delivery of blank firing adapters.

[6][7] The XCR utilizes a heavy duty bolt and extractor connected to a long stroke type gas piston.

Its proprietary bolt features a three-lug design, securely locking onto the barrel extension, which helps to keep the upper receiver unstressed.

Ejection pattern occurs at the two o'clock position relative to the operator, with an optimal distance of 15 to 20 feet, depending on the ammunition type and gas setting.

The XCR-M .308 was officially confirmed via Robinson Arms email circulation to a public reveal at SHOT show 2011.