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date: 07 December 2019

action (of firearms) 

Source:
A Dictionary of Forensic Science
Author(s):

Suzanne Bell

The mechanical process by which a *cartridge is loaded and secured into a firearm before firing and how it is removed afterward. For example, a pump-action shotgun ejects a spent cartridge and loads a new one by means of manual pumping. In terms of pistols and revolvers, the term single action means that by pulling the trigger the firing pin is driven into the primer to fire the weapon (single action only or SAO). Double action means that pulling the trigger cocks the firing pin back and releases it (DA or DAO). If the weapon is a revolver, a double action design also causes the cylinder to rotate when the trigger is pulled.... ...

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