A trunnion is a firearm component that holds the barrel to the receiver. A trunnion can be also used as part of a quick barrel change device on machine guns. Trunnions could also use locking lugs for bolt heads on the likes of delayed blowback/gas operated automatic firearms. On general purpose machine guns, trunnions usually lack the use of locking lugs as they are used on the barrel nut and also use quick removal of barrels.



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