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Glock 47: The Glock 47 is a full-sized handgun created for the U.S. Customs and Border Protection, who wanted a version of the Glock 17 that has full parts compatibility with a Glock 19, saving for the slide and barrel. This means that the G47 slide and barrel can be put on a G19 frame to give the G19 a longer slide, barrel, and sight radius ...
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.
HK417A2 - 16.5″: rifle with 419.1 mm (16.5 in) barrel; HK417A2 - 20″: "full size" rifle with 508.0 mm (20 in) barrel; A barrel can be changed in under two minutes with simple tools. All HK417 barrels are cold hammer forged and chrome-lined and use a conventional lands and grooves bore profile with a twist rate of 1 turn in 279.4 mm (11.00 in).
Miller twist rule is a mathematical formula derived by American physical chemist and historian of science Donald G. Miller (1927-2012) to determine the rate of twist to apply to a given bullet to provide optimum stability using a rifled barrel. [1]
The P30L is a P30 featuring a longer slide and barrel. (The L stands for long slide) The P30SK is a subcompact P30 featuring a shorter slide and barrel. [11] (SK stands for "subkompakt") The P30S, P30LS and P30SKS variants feature an optional external ambidextrous thumb safety. This manual safety is available for most trigger variants.
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Conversions: Drop-in barrels are available as aftermarket parts for the Glock 40, Glock 20 and Glock 29 semi-automatic pistols. [7] These pistols are originally chambered by Glock for parent cartridge of the 9×25mm Dillon, the 10mm Auto.