CHROME-PLATED CHAMBER AND BORE are critical for today’s steel and Hi-Density (HD) shot. Hard chrome makes the surfaces highly resistant to wear and gives you superior protection from rust and corrosion. That’s why all smoothbore Super X® Pump shotguns feature a hard-chromed chamber and bore. BACK-BORED TECHNOLOGY is based on extensive research and testing to find the secret to tighter, more consistent patterns. Instead of the traditional bore size of .729", this research shows the ideal 12 gauge interior diameter is .742". In 20 gauge barrels the ideal bore diameter is .630" instead of the standard .618". If the bore is any larger the gases will blow by the shot cup and reduce pellet velocity. If the bore is too tight the pellets are deformed as they pass through the forcing cone, causing poor ballistic performance. From the duck blind to the firing line, the INVECTOR-PLUS™ CHOKE TUBE SYSTEM is the world’s most consistent. The Super X® Pump comes with full, modified and improved cylinder flush-mounted choke tubes so your gun is ready for anything, right out of the box. When you shuck a fired shell out of a Winchester® Super X® Pump shotgun you’ll feel the inertia-assisted action unlock. Chamber the next shell and you’ll hear the solid click of the multi-lug bolt lockup. That’s when you discover the advantage that makes this pump so quick and slick. The Super X Pump cycles so smooth and fast you’ll think you’re shooting an autoloader. 48 Primer Hull Wad Rib Shot Crimp 5° Forcing Cone Barrel .742" Bore Diameter SUPER X ® PUMP PUT THE FASTEST PUMP ON THE PLANET RIGHT IN YOUR HANDS.