Search results
Results from the WOW.Com Content Network
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 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.
Traditional oak barrels made by Chilean cooperage Tonelería Nacional Mackmyra barrels at Häckeberga Castle Modern stainless steel casks and kegs outside the Castle Rock microbrewery in Nottingham, England Wooden wine barrel at an exhibition in Croatia. A barrel or cask is a hollow cylindrical container with a bulging center, longer than it is ...
G22 of the German Army with a fluted barrel. Closeup of PGW Timberwolf action with a helically fluted bolt. Fluting is the removal of material from a cylindrical surface in a firearm, usually creating grooves. This is most often the barrel of a rifle, though it may also refer to the cylinder of a revolver or the bolt of a bolt action rifle.
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 ...
A barrel-aged beer is a beer that has been aged for a period of time in a wooden barrel. Typically, these barrels once housed bourbon, whisky, wine, or, to a lesser extent, brandy, sherry, or port. [1] [2] There is a particular tradition of barrel ageing beer in Belgium, notably of lambic beers. [3]
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.