The SA-19 GRISON (9M111) is a radar command guided, two-stage surface to air missile mounted on the 2S6 Tunguska Integrated Air Defense System. The 2S6 vehicle is fitted with two banks of four missiles in blocks of two, which can be elevated vertically independent of each other. The SA-19 can engage aerial targets moving at a maximum speed of 500 meters/second at altitudes ranging from 15 to 3,500 meters, and at slant ranges from 2400 to 8000 meters. The missile's high-explosive fragmentation warhead is actuated by a proximity fuse if the missile passes within 5 meters of the target. The SA-19 is claimed to have a kill probability of 0.65.