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Double action (or double-action) refers to one of two systems in firearms where the trigger both cocks and releases the hammer. Double-action only (DAO) firearms trigger: The trigger both cocks and releases the hammer. There is no single-action function and the hammer will return to its decocked position after each shot.
It is also known as traditional double-action (TDA), as the vast majority of modern "double-action" handguns (both revolvers and semi-automatic pistols) use this type of trigger instead of "double-action only" (DAO). In simple terms, "double-action" refers to a trigger mechanism that both cocks the hammer and then releases the sear, thus ...
A break action is a type of firearm where the barrel(s) are hinged and can be "broken open" to expose the breech. Multi-barrel break action firearms are usually subdivided into over-and-under or side-by-side configurations for two barrel configurations or "combination gun" when mixed rifle and shotgun barrels are used.
Single-action: Usually referring to a pistol or revolver, single-action is when the hammer is pulled back manually by the shooter (cocking it), after which the trigger is operated to fire the shot. See also double-action. Single-shot: A firearm that holds only a single round of ammunition and must be reloaded after each shot.
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] These are intended for concealed carry, because the hammer of a traditional design is prone to snagging on clothes when drawn.
Because the striker is only 98% cocked prior to the trigger being pulled, Smith & Wesson classifies the M&P's action as "striker fired (double action only)". [ 5 ] [ 6 ] The M&P factory trigger is of the jointed type and has a trigger travel of 7.6 mm (0.3 in) and is rated at 29 N (6.5 lb f ).
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All Seecamp pistols are double action only (DAO), and are similar in size. Barrel length is 2.06 inches (5.2 cm), and weight is 11.5 ounces (330 g). Grips are glass-filled nylon and checkered. [6] These pistols are not equipped with sights because they are intended for use at close range. [6]