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A single-action (SA) trigger is the earliest and mechanically simplest of trigger types. It is called "single-action" because it performs the single function of releasing the hammer/striker (and nothing else), while the hammer/striker must be cocked by separate means. [1]
The MR 73 has an adjustable trigger weight in both double-action and single-action modes, a feature found in other high-end revolvers such as those built by Korth and Janz. These adjustments do not alter the strength of the main spring, ensuring reliable primer ignition. This is achieved by use of a separate flat spring controlling the trigger.
A rare class of revolvers, called automatic for its firing design, attempts to overcome this restriction, giving the high speed of a double-action with the trigger effort of a single-action. The Webley-Fosbery Automatic Revolver is the most famous commercial example of this. It was recoil-operated, and the cylinder and barrel recoiled backwards ...
Bullpup: A firearm configuration in which both the action and magazine are located behind the trigger. The Steyr AUG, the first successful bullpup rifle. Burst mode: A firing mode enabling the shooter to fire a predetermined number of rounds, with a single pull of the trigger. Browning: John Moses Browning, an American firearms designer.
The Beretta 21A Bobcat is available chambered for either .22 LR or .25 ACP (6.35 mm) ammunition. It has a simple blowback operation, with a single- and double-action trigger mechanism, and exposed hammer. It has a magazine release button in the left side grip, located between the grip retaining screws.
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The design utilizes a double-action/single action trigger mechanism, meaning that the first shot is fired with long double-action pull, with following shots fired in single-action. [3] The 457's external hammer omits a thumb spur, thereby reducing the risk of being caught on clothing during unholstering. [3]
The P220 is a full sized large pistol. The P227 uses a double row magazine for increased ammunition capacity and is very slightly larger to the point that it is not very noticeable. [3] The action is automatically propped open after the firing of the last round in the magazine. The hammer, can be safely lowered by the decocking lever.