AKA: 9A33BM;9M33M;Gecko;SA-8A. Status: Operational 1975. Payload: 15 kg (33 lb).

The starting points were designated Osa-A and Osa-K. The basic Osa-A system had 6 surface-to-air missiles on the launcher, compared to four for he basic Osa system. The Osa-K housed the missiles as 'sealed units' in a transport-launch container that would not be opened between the factory and the moment of launch one tank-transporter complex. The final solution was a combined OSA-AK system, with a new 9A33BM vehicle, which would use the new 9K33M2 launch system and could hold six 9M33M2 Osa-A missiles. Parallel trials of the two missiles were completed in June 1974. State trials of the combined Osa-AK system were conducted from September 1974 to February 1975. The system was accepted for production by the PVO and surface forces by the end of 1975. 25 m minimum altitude.