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...

Polygonal rifling (/pəˈlɪɡənəl/ pə-LIG-ə-nəl) is a type of gun barrel rifling where the traditional sharp-edged "lands and grooves" are replaced by less...

power, with a barrel that has a helical or spiralling pattern of grooves (rifling) cut into the bore wall. In keeping with their focus on accuracy, rifles...

was named MicroGroove Rifling, which was a departure from the standard "Ballard," or cut rifling. One purpose of Microgroove rifling was to increase the...

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...

A smoothbore weapon is one that has a barrel without rifling. Smoothbores range from handheld firearms to powerful tank guns and large artillery mortars...

into the rifling of the barrel and forms a seal; this seal prevents the gases from blowing past the shell and engages the barrel's rifling to spin-stabilize...

weapons used during the American Civil War, used the Minié ball.: 55  Rifling, the addition of spiral grooves inside a gun barrel, imparts a stabilizing...

exhaustive series of experiments on bullets and rifling, and he invented the important system of light rifling with increasing spiral and a hardened bullet...

rear section is without rifling, and allows the bullet an initial "run-up" to build up momentum before encountering riflings during shooting. The most...

smaller chamber and deeper rifling. The latter solution was eventually preferred and from 1938 a variant with deep rifling replaced the original barrel...

Traditionally, rounds were given gyroscopic stability in flight from the rifling of the gun barrel, which imparts a spin to the round. Up to a certain limit...

bullet is the rifling. When the bullet is fired, it is forced into the rifling, which cuts or "engraves" the surface of the bullet. If the rifling is a constant...

barrels using the radiused rifling designed by William Ellis Metford. while later models used the same square "Enfield" rifling as contemporary British military...

freebore is larger than the groove diameter of the gun barrel bore so that no rifling is present and projectiles used in the firearm can accelerate through the...

shot from shotshells. Taurus developed the shallow rifling after numerous experiments to find rifling that worked well with both types of ammunition. Though...

this pistol is the use of polygonal rifling in the barrel bore. This replaces the traditional lands and grooves rifling design with a rounded, smooth polygonal...

.50 AE bore diameter was .500 in, with conventional rifling, but the switch to polygonal rifling on production Desert Eagles allowed the gauge plug to...

greater capacity than the competing Mannlicher design. Metford's polygonal rifling was adopted to reduce fouling from powder residue building up in the barrel...

allowing the bullet to press against the rifling grooves. When fired, the bullet accompanied the rifling and spun. This was an early attempt to work...

Americans would define the shoulder angle at alpha/2 = 23 degrees. The common rifling twist rate for this cartridge is 305 mm (1 in 12 in), 6 grooves, Ø lands...

gunsmith based in Vienna. He is credited with having discovered that by rifling, that is, adding spiral grooves to the insides of the smoothbore muskets...

barrel including the rifling and if desired the chamber, so that no further work steps are required for cutting or pressing in the rifling). Then, the machine...

Note: the 1:178mm (1:7 in) rifling was compatible with the European-standard SS109 round and the 1:305 mm (1:12 in) rifling was compatible with the US-standard...

rifling to spin-stabilize the projectile in flight. The bourrelet is not engraved by the rifling, but is supported by the lands between the rifling to...

faster rifling. Therefore, if a bullet requires at least 1 turn in 7 inch twist, (1:7 rifling), in 5.56mm, it will also require at least 1:7 rifling when...

same rifling as the Short Rifle. The Artillery Carbine has a 21+1⁄4-inch (54 cm) barrel with a full stock and two barrel bands, and the same rifling as...

Measurements "across the grooves" are used for maximum precision because rifling and the specific caliber so measured is the result of final machining process...

howitzers evolved to become more mobile and versatile. The introduction of rifling in the mid-19th century led to significant changes in howitzer design and...

utilizing Marlin's trademarked Micro-Groove rifling technology, which had been developed in 1953. This rifling, with its precision-crowned muzzle, gave the...