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 been used in rifles, grenade launchers, as well as other types of firearms. A firearm using this operating mechanism is colloquially referred to as a pumpgun
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Because the forend is manipulated usually with the support hand, a pump-action firearm is much faster than a bolt-action and somewhat faster than a lever-action, as it does not require the trigger hand to be removed from the trigger while reloading. Also because the action is cycled in a linear fashion, it creates less torque that can tilt and throw the gun off aim when repeat-firing rapidly.
Many older pump-action shotguns can be fired faster than modern ones, as they often did not have a trigger disconnector, and were capable of firing a new round as fast as the pump action was cycled, with the trigger held down continuously. This technique is called a slamfire, and was often used in conjunction with the M1897 and M1912 shotguns in World War I trench warfare.[3]
Modern pump-action designs are a little slower than a semi-automatic shotgun, but the pump-action offers greater flexibility in selection of shotshells, allowing the shooter to mix different types of loads and for using low-power or specialty loads. Semi-automatic shotguns must use some of the energy of each round fired to cycle their actions, meaning that they must be loaded with shells powerful enough to reliably cycle. The pump-action avoids this limitation. In addition, like all manual action guns, pump-action guns are inherently more reliable than semi-automatic guns under adverse conditions, such as exposure to dirt, sand, or climatic extremes. Thus, until recently, military combat shotguns were almost exclusively pump-action designs.[4]
Like most lever-action rifles and shotguns, the majority of pump-action shotguns and rifles use a fixed tubular magazine. This makes for slow reloading, as the cartridges have to be inserted individually into the magazine of the firearm. However, some pump-action shotguns and rifles, including the Russian Zlatoust RB-12, Italian Valtro PM5, American Remington 7600 series, and the Mossberg 590M, use detachable box magazines.
A pump-action firearm is typically fed from a tubular magazine underneath the barrel, which also serves as a guide to the movable forend. The rounds are fed in one by one through a port in the receiver, where they are pushed forward. A latch at the rear of the magazine holds the rounds in place in the magazine until they are needed. If it is desired to load the gun fully, a round may be loaded through the ejection port directly into the chamber, or cycled from the magazine, which is then topped off with another round. Pump shotguns with detachable box magazines or even drums exist, and may or may not allow the magazine to be inserted without stripping the top round.
Nearly all pump-actions use a back-and-forward motion of the forend to cycle the action. Only a few pump-actions use the "reverse" or forward-and-back motion of the forend to cycle the action, a few examples are the Russian RMB-93 and South African NeoStead 2000. The forend is connected to the bolt by one or two bars; two bars are considered more reliable because it provides symmetric forces on the bolt and pump and reduces the chances of binding. The motion of the bolt back and forth in a tubular magazine model will also operate the elevator, which lifts the shells from the level of the magazine to the level of the barrel.
Most pump-action firearms do not have any positive indication that they are out of ammunition, so it is possible to complete a cycle and have an empty chamber. The risk of running out of ammunition unexpectedly can be minimized in a tubular magazine firearm by topping off the magazine by loading new rounds to replace the rounds that have just been fired. This is especially important when hunting, as many locations have legal limits on the magazine capacity: for example, three rounds for shotguns and five rounds for rifles.
Another variant was the Burgess Folding Shotgun from the late 19th century where instead of manipulating the forend to cycle the action, it had a sleeve around the grip area of the stock which the shooter would slide back and forward to cycle the gun. This was done because the forend based pump action was under patent at the time.[5]
Pump-action shotguns, also called pump shotguns, slide-action repeating shotguns or slide-action shotguns are the most commonly seen pump-action firearms. These shotguns typically use a tubular magazine underneath the gun barrel to hold the shells, though there are some variants that use a box magazine like most rifles. It's not uncommon to see extra ammunition stored in externally mounted "shell holder" racks (usually as "sidesaddle" on one side of the receiver, or on the buttstock) for quick on-field reloading. The shells are chambered and extracted by pulling/pushing the sliding fore-end enveloping the tubular magazine toward the user.
When used in rifles, this action is also commonly called a slide action. In the late 19th and early 20th century it was referred to as a trombone action, because it functioned similarly to the musical instrument of the same name.[8] Colt manufactured the Colt Lightning Carbine from 1884 to 1904 chambered in .44-40 caliber.[9][10] The slide action Winchester Model 1890 chambered in .22 caliber was one of the most successful repeating rimfire rifle made by Winchester. Approximately 849,000 Model 1890 rifles were produced between 1890 and 1932. Later pump-action rifles were also manufactured by Winchester, Marlin, Browning and Remington.[11]
A "reverse pump-action" design can sometimes be found, where the extraction is done by pushing the fore-end forwards, and re-chambered by pulling backwards. One such 21st-century variant is the Krieghoff Semprio "in-line repeating rifle".[12][13] The Semprio is a reverse pump-action system that ejects cartridges when the fore-end is pushed forward and loads the chamber when pulled backward. The Semprio's 7-lug bolt head design displays a locking surface of 65 mm2 (0.101 in2) compared to the 56 mm2 (0.087 in2) of the Mauser M98 bolt-action rifle.[14]
The term pump-action can also be applied to various airsoft guns and air guns, which use a similar mechanism to both load a pellet and compress a spring piston for power, or pneumatic guns where a pump is used to compress the air used for power. See the airgun article for information on how spring piston and pneumatic airguns work.
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