The Gryazev-Shipunov GSh-6-30 is a Russian 30mm cannon used by Soviet and later CIS military aircraft.
The GSh-6-30, designed in the early 1970s and entering
service in 1975, is a six barrelled Gatling gub similar in design to the
Gryazev-Shipunov GSh-6-23. It was based on the naval AQ-18 used in the AK-630
system. Unlike rotary cannon, it is gas operated rather than electric, aloowing
it to “ spin up “ to maximum rate of fire more quickly, allowing more rounds to
be placed on target in a short-duration burst. Ignition is electrical, as witj
the smaller GSh-6-23.