M-4 "Osa-M" (GRAU index - 4K33, according to NATO classification: SA-N-4 Gecko ("Gecko")) is a Russian automated naval double-boom anti-aircraft missile system, a naval version of the Osa air defense system. Designed according to uniform tactical and technical requirements and there are no significant differences in their design. The Osa-M air defense system is completely unified with the Osa military complex for the 9M33 missile and 70% for the control systems, but it has only two missiles ready for launch, against four (and later six) for the land version.

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