is 9 to 10 seconds. The missile has a single 4.5 kg HEAT warhead, which can penetrate 600 mm of RHA. Variants 9M112 – basic version of the missile, entered service in 1976 as part of the 9K112 missile system in the T-64B 9M112M – upgraded modification tested in 1977 and adopted in 1978 as part of the 9K112-1 missile system in the T-80B, armour penetration increased by 20%. Production started in 1979. 9M112M2 – 9M112 variant with armour penetration increased by 40% compared with the initial model, testing started in 1983. The missile's dimensions and operating conditions remained unchanged. 9M124 – variant of the 9M112M2, similar in design, but has a more powerful warhead (armour penetration increased by 80% relative to the base variant of the missile) 9M128 – upgraded missile system called "Agona" with a tandem warhead; development started in 1984 but, in 1985, the Svir and Refleks missile systems entered service in place of "Agona". Nevertheless, in 1986, "Agona" entered the state tests, and in 1988 it was put into service. Operators Current operators Former operators : Passed on to successor states. See also List of gun-launched missiles References Hull, A.W., Markov, D.R., Zaloga, S.J. (1999). Soviet/Russian Armor and Artillery Design Practices 1945 to Present. Darlington Productions. . Janes Armour and Artillery 2005-2006, External links Anti-tank guided missiles of the Cold War Anti-tank guided missiles of the Soviet Union KB Tochmash products Military equipment introduced in the 1970s