Pump action is a type of firearm mechanism that allows the shooter to manually cycle the action by moving a sliding fore-end back and forth. This action ejects the spent cartridge and chambers a new round, making it ready to fire again. Pump action is commonly found in shotguns, such as the Remington 870 and Mossberg 500, and is known for its reliability and ease of use. The pump action mechanism is popular for both hunting and home defense due to its simplicity and effectiveness. Users can quickly reload and fire multiple shots without needing to take their eyes off the target. This design has been widely adopted in various firearms, providing versatility in different shooting scenarios.