The Smith & Wesson Model 22A is a semi-automatic pistol that was 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.