Lock (firearm)

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The lock of a firearm is the mechanism used to initiate firing. It is generally used as a historical term, referring to such mechanisms used in muzzle-loading and early breech-loading firearms, as modern firearms uniformly fire by use of a firing pin to strike the rear of a cartridge. Side-lock refers to the type of construction in which the individual components of the mechanism are mounted on either side of a single plate. The assembly is then mounted to the stock on the side of the firearm. In modern firearm designs, the mechanism that initiates firing is generally built into the frame or receiver of the firearm and is referred to as the firing or trigger mechanism.