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Double-action – firearms trigger: Pressing the trigger 1) cocks, and 2) drops the hammer. The hammer can also be cocked to fire in single-action (SA) mode. With a DA revolver, the hammer can be cocked first (single action), or the trigger can be pulled and it will cock and release the hammer (double action). [1]
Most modern revolvers are "traditional double-action", which means they may operate either in single-action or self-cocking mode. The accepted meaning of "double-action" has come to be the same as "self-cocking", so modern revolvers that cannot be pre-cocked are called "double-action-only". [25]
Most traditional semi-automatic double-action/single action (DA/SA) pistols are designed to be carried with the hammer down (uncocked) on a chambered round, with or without a manual safety engaged. The pistol is considered safe in this state as the "double-action" pull that both cocks and fires the firearm is both longer and heavier than the ...
Actions can be categorized in several ways, including single action versus double action, break action versus lever-action, pump-action, bolt-action, among many other types. The term action can also include short, long, and magnum if it is in reference to the length of the rifle's receiver and the length of the bolt.
The trigger comes from the factory with a 24 newtons (5.5 lbf) single-action pull, and is capable of both single-action and double-action. Pulling back the slide sets the hammer backwards and downwards to its single-action position, making for a very short trigger pull, with minimal take-up. The double-action pull is longer and more stiff.
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Most airbrushes can be grouped into two types of trigger action: Single-action or double-action. The simplest airbrushes work with a single-action mechanism, where the depression of the trigger actuates air flow through the airbrush, immediately outputting paint. The airbrush's color flow and spray pattern are adjusted separately from the ...
double-action: refers to an instrument on which each key or button produces a single note, [6] as does unisonoric (recently coined as the counterpart of bisonoric) [citation needed] reversal: on a single-action instrument, a button or key which produces a note available elsewhere on the keyboard, but obtained by using the opposite bellows direction