Most of these low-powered models are cocked by some sort of lever which pulls back a piston against a spring. Production of American BB guns began in the late 1800s. Air rifles of this type were used in Europe in the late 1500s, and Lewis and Clark took such an air rifle on their historic Voyage of Discovery in 1804-1806. Some of the early air rifles utilized projectiles of. Part of the air could be discharged behind a projectile to drive it forward. Some of the early air rifles had a reservoir (in some cases, the rear section of the stock and in others a hollow sphere located below the action) in which air compressed by use of an external pump was stored. The major difference between types of air rifles is how the air is compressed and where it is stored. At that time, the gas is released behind the projectile which propels it down the barrel. The essential feature is that compressed air is stored in the gun until the time of firing. Although modern airguns differ markedly from early versions, the basic principles utilized in the construction of airguns have been employed for centuries.
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