Every M1A1 projectile has flame able body and steel ground case. Furthermore there is a number of training projectiles. M256 combat load consists from unitary load with two main type projectiles: M827 undercaliber armor-piercing, with separating case and wolfram or percipient uranium heads M830 multipurpose cumulative and high explosion-fragmentation projectiles. Similar gun was placed in German main battle tank "Leopard 2". Main battle tank firepower was increased by new M256 120-mm smoothbore main gun, produced in USA under German "Rheinmetall" company license. Driver-mechanic use motorcycle-type steering wheel connected with automatic transmission. It allowed greatly incline frontal armed plate in vertical inclination level such increasing defense from armor-piercing projectiles. Similarly to British main battle tanks "Chieftain" and "Challenger", driver-mechanic with closed hatch is placed in half-lying position. Hull and turret are welded with multi-layered frontal armor similar to British armor "Chobhem" bu additionaly increased with by precipitant uranium plates built-in in frontal hull and turret multi-layer armor. Main battle tank has classic arrangement with frontal drivers compartment. Production lasted till 1993 when it was changed to improved modification M1A2. "General Dynamics" corporation was also producing M1A1 tanks under license. M1A1 main battle tanks were built in Ohio state, Lima city, national tank plant and in Michigan state, Voren city, "Detroit Arsenal" tank plant. Firstly they were deployed in US tank forces in German Federation Republic. In 1986 first modernized M1A1 "Abrams" entered service in US Armed Forces. Since 1988 M1A1 modification was produced with built-in precipitant uranium armor. M1A1 differed firstly in greater firepower and increased defense.
Second and third modernization stages were made accordingly in 19 and led developing M1 "Abrams" main battle tank modernization M1A1 as new modification had a number greater abilities than it’s predecessor. This modification was idexed M1E1 and it was step to the new ability modification. First stage begun in 1984 already, after four years after the beginning of the serial production, and projected to increase frontal defense and apply new M733 projectile with increased armor-piercing ability. During M1 "Abrams" main battle tank serial production there were made some modernization stages.
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