We offer various pump shotguns in a variety of gauges from the popular 12 gauge shotgun to the 28 gauge from best selling brands like Mossberg, Remington, and Having everything you need for a hunting trip can make a difference. Shop for pump action shotguns, and other 12 & 20 gauge shotguns at Gunslinger. Pump action is a type of manual firearm action that is operated by moving a sliding handguard on the gun’s forestock. When shooting, the sliding forend is pulled rearward to eject any expended cartridge and typically to cock the hammer or striker, and then pushed forward to load a new cartridge into the chamber. Most pump-action firearms use an integral tubular magazine, although some do use detachable box magazines. Pump-action firearms are typically associated with shotguns, although it has also been used in riflesgrenade launchers, and other types of firearms. A firearm using this operating mechanism is colloquially referred to as a pumpgun.