"The lock of a firearm is the mechanism used to initiate firing. It is a historical term, in that it generally refers to such mechanisms used ...
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in muzzle-loading and early breech-loading firearms. Side-lock refers to the type of construction, in which the individual components of the mechanism are mounted 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 to initiate firing is generally constructed within the frame or receiver of the firearm and is referred to as the firing or trigger mechanism." - (en.wikipedia.org 19.02.2024)
