In some cases, barrels have had to be replaced after firing only 50 projectiles.  Ten of the 17 turrets built were equipped with the 105 mm smoothbore gun, and the other seven were equipped with the larger 120 mm gun. The 120mm M831A1 cartridge is a target practice round that simulates the ballistics of the M830 chemical energy service round. For example, a long line of armor-piercing discarding sabot (APDS) rounds was developed by Rheinmetall. , In 1963 Germany and the United States had already embarked on a joint tank program, known as the MBT-70.  Another program aimed to mount the 152-millimeter (6.0 in) missile-gun was also developed in an attempt to save components from the MBT-70, but in 1971 the program was ended for economic reasons. DM11 cartridge on behalf of the German Ministry of Defence. Simple: Because the L-55 did not exist when the Abrams was built. The bore evacuator and the gun's thermal sleeve, designed to regulate the temperature of the barrel, are made of glass-reinforced plastic, while the barrel has a chrome lining to increase barrel life. The Leopard 2A6 and its longer L/55 main gun have been exported for use by the Canadian Army, and the Netherlands upgraded part of its original fleet of Leopard 2s with the more powerful armament. The German company is proposing the solution as part of plans to extend the life of the CR2 through the British Army’s Life Extension Programme (LEP). Because of concerns about the inability of the 105-millimeter (4.1 in) L7 tank gun then in use across NATO forces to penetrate new Soviet armor, as proved in German tests on four T-62 Soviet tanks captured by Israel following the June 1967 Six-Day War, Rheinmetall was paid for the development of a new tank gun. , In 1967, the German Ministry of Defense decided to re-open a Leopard 1 improvement program, known as the Vergoldeter Leopard ("Gilded Leopard"), later renamed the Keiler ("Wild Boar"). , The longer tank gun has been retrofitted into the Leopard 2, creating a model known as the Leopard 2A6. , The German government began the development of the Leopard 3, although this was canceled after the fall of the Soviet Union. This is a set of white metal or photo-etched parts for detailing AFV kits. It can also be found on tanks produced by Japan, South Korea, and Turkey.  This case is similar to the American decision to replace the M68 105-millimeter (4.1 in) tank gun with Rheinmetall's 120 mm gun in 1976; the introduction of the T-64A had raised the question within the armor community whether the new ammunition for the existing gun caliber could effectively deal with the new Soviet tank. A project started in 1965, as the Bundeswehr felt a more powerful gun was needed for its new tanks.  The M829 series centers around the depleted uranium penetrator, designed to penetrate enemy armor through kinetic energy and to shatter inside the turret, doing much damage within the tank. "Arming Future MBTs – Some Considerations". The LAHAT, developed in Israel, is a gun-launched missile which has received interest from Germany and other Leopard 2 users, and is designed to defeat both land armour and combat helicopters. Fort Knox, KY: U.S. Armor Center. , A variety of rounds have been developed for Rheinmetall's tank gun. The Israelis also introduced a new anti-personnel munition which limits collateral damage by controlling the fragmentation of the projectile. An immediate improvement, known as the M829A1, was called the "Silver Bullet" after good combat performance during the Gulf War against Iraqi T-55s, T-62s and T-72s. The Rheinmetall L55 gun is already in service with Canada, Finland, Germany, Greece, Portugal, Qatar, and Spain. Bolté, Philip L.; Iwao Hayashi (1 January 1997). Description . Originally, the Leopard 2 was outfitted with the DM23 kinetic energy penetrator, based on the Israeli M111 Hetz.  The M1A1 has also been exported to Australia, while the M1A2 Abrams has been exported to Saudi Arabia and Kuwait.. $18.99 + $4.50 shipping .  This was later developed into the M830A1, which allows the M1 Abrams to use the round against helicopters. Rheinmetall 120mm L55 Leopard Metal Gun Barrel Set (for Meng Model TS-027) (Plastic model) Orange Hobby Other picture4 on the Web.  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