The MTs 21-12 (МЦ 21-12) is a Soviet semi-automatic shotgun. History The shotgun was designed in 1956-1958 in TsKIB SOO, it was the first Soviet semi-automatic shotgun. In 1965, the shotgun was awarded the golden medal of the Leipzig Trade Fair. Since 1965 began the serial production of the shotgun by Tula Arms Plant. The price of one standard MTs 21-12 was 350 roubles and custom guns were more expensive. In February 1981 a detachable ring sight was proposed for this shotgun. In April 1981, the price of one standard MTs 21-12 was 335 roubles and custom guns were more expensive. In December 1988, MTs 21-12 was the most common semi-automatic hunting shotgun in the Soviet Union (the second was Browning Auto-5), 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. In September 1994, the cost of one new standard serial MTs 21-12 shotgun was from 480 thousand roubles to 3.3 million roubles. Over 300 000 MTs 21-12 shotguns were produced. Unknown number of shotguns were sold in foreign countries. Design MTs 21-12 is a smoothbore shotgun. The detachable barrel is chrome-plated and has 1mm choke at the muzzle end. It has a walnut shoulder stock (with or without cheekpiece) and fore-end Shotgun shells with paper or plastic cases must be used for shooting. It should be taken into account that the USSR produced two different types of 12 gauge plastic cases, and for shooting from MTs 21-12 it was recommended to use plastic cases with a length of 67.5-68 mm, made according to GOST 23568-79. Variants MTs 21 (МЦ 21) - the first version, was produced by TsKIB SOO in small numbers for less than a decade. It was chambered for 12, 16 and 20 gauge MTs 21-12 (МЦ 21-12) - the main production version, was produced by Tula Arms Plant from 1965 and was chambered only for 12/70 shells MTs 21-12P (МЦ 21-12П) MTs 21-12R (МЦ 21-12Р) - MTs 21-12 with rubber recoil pad on its shoulder stock MTs 22-12 (МЦ 22-12) - was chambered only for 12/65 mm shells, and only one prototype was made in 1960 TTs 22 (ТЦ 22) - next model Users - is allowed as civilian hunting weapon - is allowed as civilian hunting weapon - is allowed as civilian hunting weapon