gas-operated

[ gas-op-uh-rey-tid ]
/ ˈgæsˌɒp əˌreɪ tɪd /
|

adjective

(of a firearm) using some of the exhaust gases to operate the action.

Origin of gas-operated

First recorded in 1940–45
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for gas-operated