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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.
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.
The barrel is thick and rigid to prevent it from flexing. All AR-50 barrels use 1:15 right hand rifling. The receiver features Armalite's octagonal design, strengthening the receiver against flexing. The receiver is bedded to the V-shaped stock, while the barrel is free-floated above the forend. The three-piece AR-50 stock is constructed from ...
Marlin Model 70P "Papoose", a lightweight, magazine-fed, .22 LR carbine with a detachable barrel; it is designed to be taken down for easy transport while camping, backpacking, etc. Marlin Model 795, a .22 LR semi-automatic rifle. Marlin Model 700, a .22 LR semi-automatic rifle, similar to the Model 795, but has a heavy tapered target barrel
The distance across the bore from groove to groove is greater than the distance from land to land. Projectiles fired from rifled barrels must be of the full groove-to-groove diameter to be effectively rotated by the rifling, but the caliber has sometimes been specified as the land-to-land diameter before rifling grooves were cut.
Springfield Model 1861 rifle musket Pattern 1853 Enfield rifle musket. A rifled musket, rifle musket, or rifle-musket is a type of firearm made in the mid-19th century. . Originally the term referred only to muskets that had been produced as a smoothbore weapon and later had their barrels replaced with rifl
Closeup of chamber throat depicting relationship between freebore diameter, rifling groove diameter, and land diameter. The chamber is the rearmost portion of a firearm barrel that has been formed to accept a specific handgun/rifle cartridge or shotgun shell. [5]
The rifle itself is offered in two variants: the S-5.56 A1 with a 19.9-inch barrel and 1:12 pitch rifling (1 turn in 305 mm), optimized for the use of the M193 Ball cartridge; and the S-5.56 A3 with a 20-inch barrel and a 1:7 pitch rifling (1 turn in 177, 8 mm), optimized for the use of the SS109 cartridge.