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ArmaLite Early ArmaLite AR-15 ultra-lightweight 'Hollywood' turned-down profile barrel, 1:14 twist only; A1: Also referred to as the "lightweight" or "pencil" profile. Government-specified barrel profile increased to between 0.675 and 0.575 inches; A2: Also referred to as the "government" or "gov't" profile. Barrel profile for which the portion ...
20-pounder Parrott rifle, rear view, Gettysburg NMP. The 20-pounder Parrott rifle had a bore (caliber) with a diameter of 3.67 in (93 mm) and fired a projectile weighing 20 lb (9.1 kg). Its gun barrel was 84 in (213 cm) long and weighed about 1,750 lb (794 kg).
Note: Use of this table for estimating bullet masses for historical large-bore rifles is limited, as this table assumes the use of round ball, rather than conical bullets; for example, a typical 4-bore rifle from circa 1880 used a 2,000-grain (4.57 oz; 129.60 g) bullet, or sometimes slightly heavier, rather than using a 4-ounce (110 g) round ...
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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.
The bore axis of a firearm is the longitudinal axis through the geometric center of the gun barrel. In a rifled barrel, the projectile (bullet/ball, pellet or slug) will spin around the bore axis as it goes through the barrel. Boresighting is a process of placing one's line of sight down along the bore axis.
It is a bolt action hunting rifle with a fixed magazine with hinged floorplate produced in a number of centrefire calibers in three variants, the normal, the full-length stock Stutzen ("short") and the carbine. Weight: Length: 44.5 inches (40.5 for Stutzen and carbine variants) Barrel Length: 24 inches (20 inches for Stutzen and carbine.)
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