Beretta A400 Xtreme PLUS KO, Semi-automatic, 12 Gauge, 3.5 Chamber, 26 Barrel, Mossy Oak Bottomland Camo Finish, Synthetic Stock, Right Hand, Includes 5 Choke Tubes - F,IM,M,IC,C, Fiber Optic Sights, 2 Rounds J42XU16 The A400 is a gas-operated action that was built for speed, reliability and versatility. The A400 action is self-cleaning, so it requires much less maintenance than any other shotgun you'll ever own. When you take this gun apart you'll be amazed by the intuitive simplicity of the tool-free field-stripping process and by what little maintenance the A400 requires.