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Only the upgrades to the Pattons were carried out, with the results being the M48A3K and M48A5K, while producing Leopard 1s was deemed counterproductive, as a newer generation of main battle tanks were already being developed and tested in both the U.S.

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A number of other plans were also devised, such as upgrading the existing M48 Pattons to the M48A3 and A5 standard, as well as obtaining the license to domestically produce Germany's Leopard 1 main battle tank. It was deemed that, even if the M60A1s were obtainable, there would not be enough of them to give the South Korean forces a significant advantage over existing North Korean tanks. Meanwhile, North Korea had both numerical and technological advantages over the South Korean armor with their T-62 main battle tanks.ДЄt first, attempts were made to obtain the United States' M60A1 Pattons, but they ended in failure. The M4A3(76)W HVSS 'Easy Eight' variant of Sherman tanks, dating back to World War II, had been retired from service by the South Korean army, and the backbone of the South Korean armored forces were M47 and M48 Patton tanks. In the 1970s, South Korea was desperately in need of additional main battle tanks.

Hyundai Rotem produced 1,511 K1 and K1A1 tanks between 19. The K1A1 entered service in 1999, upgraded with a 120В mm smoothbore gun, and outfitted with more modern electronics, ballistic computers, and fire control systems developed by Samsung Electronics.

The vehicle's early design work was based on Chrysler's XM1, with some noticeable differences including a combined system of hydropneumatic suspension and torsion bars, and a river-crossing fording kit, to meet the required operational capability that was specific to combat operations in the mountainous and swampy terrain of the Korean Peninsula. The K1 is a South Korean main battle tank in use with the Republic of Korea Armed Forces, developed by Hyundai Precision (later Hyundai Rotem).