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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.
Functionally, the M15 operates the same as a basic M1911 Colt pistol. The shorter barrel is reported to have a greater muzzle blast, yet even with the abbreviated barrel, the pistol maintains a muzzle velocity of 245 m/s (800 ft/s). The pistol's sights are larger than the standard M1911A1's, including a taller front sight. [4]
The Official Police was machined of fine carbon steel, with blued or nickel-plated finishes, and was offered in 4, 5 and 6 inches (100, 130 and 150 mm) barrels.Built on Colt's .41 or "E" frame, it was manufactured in a variety of chamberings, including .22 LR, .32-20 (discontinued in 1942), .41 Long Colt (discontinued in 1938), and the most common and popular, the .38 Special.
An officer’s tool (also known as an A-tool, rex tool, or lock puller) is a forcible entry device used by firefighters and other first responders. Officer’s tools are designed to completely remove cylindrical locks from doors without causing major structural damage, allowing for direct access to the internal locking mechanism.
The Colt Officer's Model or Colt Officer's ACP is a single-action, semi-automatic, magazine-fed, and recoil-operated handgun based on the John M. Browning designed M1911. It was introduced in 1985 as a response from Colt to numerous aftermarket companies making smaller versions of the M1911 pistol.
The cold hammer-forged barrel has a polygonal profile while the slide is made from a solid bar of nitro-carburized steel. Following recent trends in modern pistol design, the P2000 makes extensive use of impact-resistant polymers to reduce weight and production costs.
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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.