gas-operated

It is of the heavy type, gas operated, air cooled, and belt fed.

It is a gas-operated gun, something like the Colt, and it is air-cooled.

The Skoda gun, some of which type are used in Japan and China, is loaded by a hopper feed, and is gas-operated.

This gun is of a heavy type, air-cooled, gas-operated, and fed from either a strip holding 30 cartridges or a metallic link belt.

It is also fitted with a fog bell struck automatically by a gas operated mechanism.