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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]
Single action trigger pull is 4.4 lbs while Double-action is 12.4 lbs. The polymer frame and small size (compared to the SIG P226) allow the pistol with magazine to weigh little more than 24.6 oz. The overall height is 5.3 inches with a barrel length of 3.9 inches. The Mosquito's frame has an accessory rail, a ten-round capacity magazine, and ...