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A rifle is a firearm designed to be fired from the shoulder, with a barrel that has a helical groove or pattern of grooves ("rifling") cut into the barrel walls.The raised areas of the rifling are called "lands," which make contact with the projectile (for small arms usage, called a bullet), imparting spin around an axis corresponding to the orientation of the weapon.
Rifling of a 105 mm Royal Ordnance L7 tank gun Conventional rifling of a 90 mm M75 cannon (production year 1891, Austria-Hungary) Rifling in a GAU-8 autocannon. Rifling is the term for helical grooves machined into the internal surface of a firearms's barrel for imparting a spin to a projectile to improve its aerodynamic stability and accuracy.
Conventional eight groove rifling on the left, and octagonal polygonal rifling on the right. Polygonal rifling (/ p ə ˈ l ɪ ɡ ə n əl / pə-LIG-ə-nəl) is a type of gun barrel rifling where the traditional sharp-edged "lands and grooves" are replaced by less pronounced "hills and valleys", so the barrel bore has a polygonal (usually hexagonal or octagonal) cross-sectional profile.
The term was originally rifled gun, with the verb rifle referring to the early modern machining process of creating grooves with cutting tools. By the 20th century, the weapon had become so common that the modern noun rifle is now often used for any log-shaped handheld ranged weapon designed for well-aimed discharge activated by a trigger.
The Model 99 and Model 1899 were preceded by the Model 1895, which was the first hammerless lever-action rifle. [13] The 1895, as well as the later Model 1899 and early Model 99, used a five-shot rotary magazine to hold the cartridges. [14] The rotating magazine uses a spring-loaded spool with grooves to hold the cartridges.
The Mountie has a magazine capacity of 20 Short, 16 Long or 15 Long Rifle .22 cartridges. Since 1954 Marlin has used their proprietary Micro-Groove rifling in the Model 39A. This rifling uses many small lands and grooves rather than 2, 4, or 6 deeper grooves used by the majority of rifle makers. The rifling is also made to a 1 in 16" right hand ...
Since the Brunswick used a round that was specifically designed to be mated with the grooves in the rifle, it had to be oriented properly in order to be loaded. This made the rifle difficult to load at night, when the grooves could not be seen. [4] The lock was originally a back action design, with the mainspring located behind the hammer.
The West Point Foundry produced about 300 20-pounder Parrott rifles between September 1861 and July 1864. The gun barrels weighted between 1,635 lb (742 kg) and 1,815 lb (823 kg). The rifling consisted of five lands and grooves of right-hand gaining twist (increasing toward the muzzle) and the caliber (bore diameter) was 3.67 in (93 mm). [6]