Operating Mechanism
The XCR employs a Kalashnikov type, gas operated action with the bolt carrier attached to a long-stroke gas piston; the gas chamber is located above the barrel.
The proprietary bolt is a three-lug design that locks onto the barrel extension leaving the upper receiver unstressed. There is no need to check the headspace when changing barrels. A steel fixed ejector is attached to the inside of the receiver, held in place by two bolts. The manufacturer claims this design provides stronger ejection than what is offered on the AR-15’s spring-loaded ejector design. The ejection pattern is to the two o'clock position of the operator, with an optimum distance of 15 ft to 20 ft depending on ammunition type and gas setting.
Magazines are STANAG 4179 type.
Read more about this topic: Robinson Armament XCR
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