The Smith & Wesson Model 22A is a semi-automatic pistol manufactured in Houlton, Maine. The 22A is a full-size pistol with an aluminum alloy frame. The steel barrel has an integrated Weaver style rail (similar to a Picatinny).
This pistol is distinguished by two features: An integral rail along the top edge of the gun permits easy mounting of optical sights and other accessories. The gun's alloy frame and alloy-shrouded barrel help keep weight down for a full-sized pistol.
The 22A is a single-action semi-automatic .22 caliber pistol. This means that after chambering the first round by pulling back and releasing the slide, each firing ejects the spent cartridge, cocks the firing pin, and then strips a new round from the magazine and loads it into the chamber. With a single action the firing pin or hammer is automatically cocked and pulling the trigger simply releases the firing pin. This results in a lower trigger pull force than a double-action pistol where the trigger must first cock the firing pin and then release it.
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