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The ACR "rifles" used smoothbore barrels to fire single or multiple flechettes (tiny darts), rather than bullets, per pull of the trigger, to provide long range, flat trajectory, and armor-piercing abilities. Just like kinetic-energy tank rounds, flechettes are too long and thin to be stabilized by rifling and perform best from a smoothbore barrel.
Muzzle of a Rheinmetall 120 mm L/55 tank gun on a Spanish Leopard 2E. The Rheinmetall Rh-120 is a 120 mm smoothbore tank gun designed and produced in former West Germany by the Rheinmetall Waffe Munition GmbH company. It was developed in response to Soviet advances in armour technology and development of new armoured threats.
semi-automatic vertical sliding-breechblock. Recoil. 304.8 mm (12.000 in) The M256 is an American 120 mm smoothbore tank gun. It is a licensed-built German-designed Rheinmetall Rh-120 L44 gun tube and combustible cartridges with an American-designed mount, cradle and recoil mechanism. It is primarily used by the M1 Abrams main battle tank.
In the 1960s, smoothbore tank guns were developed by the United States, the Soviet Union, and later by the experimental American-West German MBT-70 joint project. High-precision smoothbore tank gun barrels were perfected by the US Army's Weapons Laboratory at the Watervliet Arsenal based on a pair of patents by inventor Albert L. de Graffenried.
The CN08 (Cannon 08) is a 120 mm 55-caliber smoothbore tank gun produced by Hyundai WIA. It is incorrectly known as the licensed production of the Rheinmetall Rh-120 L/55, but it was indigenously developed by the Agency for Defense Development and WIA (now Hyundai WIA) from 2003 to 2008 for the XK2 development project started in 1995. [5]
Both the original smoothbore version and the modified rifled version of the Model 1842 were used in the American Civil War. The smoothbore version was produced without sights (except for a cast one on the barrel band). When Model 1842 muskets were modified to have rifled barrels, sights were usually added at the same time as the rifling.
Combination guns are over/under designs such as the Savage Model 24, usually with a rifled barrel over a smoothbore barrel. Iron sights are commonly used for aiming the rifle, and the front sight alone is sufficient to point the shotgun. Scope mounts are available for some designs. An interesting combination gun is the United States Air Force ...
Russia. 2,000 m-high target – 1,870 m; 3 m-high target – 2,260 m; [1] 4,000 m AT-12 missile. The U-5TS (production designation 2A20) tank gun is a 115 mm- calibre weapon that was fitted almost [a] exclusively to the Soviet Union's T-62 main battle tank. It was the first smoothbore weapon designed for tanks, [2] and heralded the change in ...