Search results
Results From The WOW.Com Content Network
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.
Gradually, rifles appeared with cylindrical barrels cut with helical grooves, the surfaces between the grooves being "lands". The innovation was shortly followed by the mass adoption of breech-loading weapons , as it was not practical to push an overbore bullet down through a rifled barrel.
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.
[36]: 32 The three main class characteristics of all bullets are the lands and grooves, the caliber of the bullet, and the rifling twist. [37] All three can be tied directly to the type of barrel that was used to fire the bullet. [37] The lands and grooves of barrel are the bumps and valleys created when the rifling is created. The caliber is ...
Brachioradial pruritus (sometimes abbreviated BRP) is an intense itching sensation of the arm usually between the wrist and elbow of either or both arms. [1]: 36 The itch can be so intense that affected individuals will scratch their own skin to a bleeding condition.
An itchy lower hand or wrist is connected to the root chakra and can represent increased abundance and good fortune." Since the palms are believed to be connected to the heart chakra, Spires ...
The roller-delayed blowback StG 45(M) assault rifle prototypes proved pressure equalization fluting is desirable, since the breech of roller or lever-delayed blowback arms is opened whilst under very high internal cartridge case pressure that presses a spent (bloated) cartridge casing against the chamber walls which can cause significant ...