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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.
A double-action trigger, also known as double-action only (DAO) to prevent confusion with the more common hybrid DA/SA designs, is a trigger that must perform the double function of both cocking and releasing the hammer/striker.
Unlike the rest of the M&P pistols, the M&P Bodyguard 380 is not striker fired. It is a traditional double-action-only hammer-fired pistol intended for personal protection, concealed carry or as a law enforcement "back-up" handgun. Some models incorporate a manual safety. [4]
The second way is double-action, or from a hammer-down position. In this case, the trigger first cocks the hammer and revolves the cylinder, then trips the hammer at the rear of the trigger stroke, firing the round in the chamber. Enfield No. 2 Mk I* double-action-only revolver. Note the spurless hammer.
The 3rd series added single/double-action triggers on several models in lieu of the double-action only of the first two series. Additionally, the grips of 3rd generation pistols are available in various different colors and the grip stippling is altered; tactical or Picatinny rail accessory mounts are also an option. [8] [self-published source]
Developed for the U.S. government, the Law Enforcement Modification (LEM) is a double-action only model with a unique trigger mechanism. This mechanism improves the double-action trigger performance and reduces the weight of the double-action trigger pull to 8 pounds-force (36 N), uses a stronger hammer spring, and shortens the trigger reset.
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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]