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One sort of pump once common worldwide was a hand-powered water pump, or 'pitcher pump'. It was commonly installed over community water wells in the days before piped water supplies. In parts of Britain and Ireland, it was often called the parish pump .
The 43mm GM-94 is a pump-action grenade launcher developed by the KBP design bureau for use by Russian special forces. It carries three rounds in an above-the-barrel tubular magazine. Another pump-action grenade launcher is the China Lake grenade launcher, which saw usage by the U.S. Navy SEALS in the Vietnam War in limited numbers.
It was the first truly successful pump-action shotgun produced. Throughout the time period the Model 1897 was in production, over a million of the type were produced in various grades and barrel lengths. 16-gauge guns had a standard barrel length of 28 in (71 cm), while 12-gauge guns were furnished with 30 in (76 cm) length barrels.
Consequently, the pump barrel fills with the fluid from the formation as the traveling piston lifts the previous contents of the barrel upwards. When the rods begin pushing down, the traveling valve opens and the standing valve closes (due to an increase in pressure in the pump barrel). The traveling valve drops through the fluid in the barrel ...
Barrels: Barrels have ultimately been offered in lengths from 18 inches (460 mm) to 30 inches (760 mm) in 2-inch (50 mm) increments. Barrels have been chambered for 12, 16, or 20-gauge with either a 2.75-inch (70 mm) or 3-inch (76 mm) chamber. They have been offered with fixed choke (IC, M, F, Skeet and CB) or with Winchoke attachments.
A pump action rifle is a rifle where the forend can be moved forward and backward in order to eject a spent round of ammunition and to chamber a new one. Pump-action mechanisms are often regarded as 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.
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