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. FEATURES: Low Profile Action; Fastest Follow-Up Shots of Any Shotgun; Low-Recoil; Self-Cleaning Piston FINISH: BLACK