There are a few rimfire ammunition calibers besides the 22, but they are rare and not widely available. Normally 22 caliber ammunition used for target shooting, plinking, and small game hunting. In a rifle, pistol, or shotgun, it is the part of the barrel that accepts the ammunition. In a revolver, it refers to the holes in the cylinder where the cartridges are loaded. An interior tube at the end of a shotgun barrel that controls shot dispersion.
Chokes typically come in cylinder, improved cylinder, modified, improved modified, and full.
Different chokes are used for skeet, trap, and sporting clays. In hunting, the type of game and conditions will determine choke type. To place the hammer, or striker, in position for firing by pulling it back fully. A generic term referring to many variations of pocket-sized pistols. The name comes from the pistol's original designer, Henry Derringer.