Assembly

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There are two levels of assembly: subassembly and final assembly. Subassembly is the completion of components requiring attachment of multiple pieces. Final assembly creates a finished, functional firearm from the combination of these components.

Subassembly

Parts that usually require subassembly include these:

Hammers
Triggers (including trigger groups in some classes like semi-auto and pump shotguns)
Cylinders
Bolts
Slides

Subassembly is usually required for major components, such as semiautomatic pistol slides and rifle bolts. Several tasks in the functioning of a firearm are performed by these major components, including housing the firing pin and performing the extraction of the cartridge case. These functions are accomplished by small parts and springs that are attached to the major component. The process of fitting smaller parts to major components allows for a better final assembly flow.

Click here to watch a video on firearm subassembly operations courtesy of Savage Arms.

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