[2][4] Since 1965 began the serial production of the shotgun by Tula Arms Plant.

[6] In April 1981, the price of one standard MTs 21-12 was 335 roubles and custom guns were more expensive.

[7] In December 1988, MTs 21-12 was the most common semi-automatic hunting shotgun in the Soviet Union (the second was the MC-22, a clone of the Browning Auto-5),[2] although TOZ-87 had already begun to make.

After the fall of the Soviet Union due to the economic crisis in Russian Federation in the 1990s, the prices of firearms increased.

[7] It has a walnut or beech shoulder stock (with or without cheekpiece) and fore-end[7] Shotgun shells with paper or plastic cases must be used for shooting.