A Remington Model 870 pump-action shotgun.
Pump action is a manually reloaded firearm operation which is cycled via the slide assembly (positioned underneath the barrel) after each time it is fired to eject the spent casing and chamber another round. When used on a rifle, it is often referred to as a slide action.
Grenade launchers[]
Pump action has been found on various grenade launchers, with the China Lake grenade launcher and GM-94 being examples.