EntityQ1509508· pop 13· linked from 119 articlesM197Sign in to save20 mm Gatling-type autocannon aircraft armamentConnectionsM134 MinigunEntityUnited States Marine CorpsEntityGeneral DynamicsEntity7.62×51mm NATOEntity7.62×54mmREntity.50 BMGEntityBell AH-1 SuperCobraEntity30 mm caliberEntityYak-BEntityMetal StormEntity20 mm cartridgeEntity23×115mmEntityUnited StatesCountryTurkeyCountryRussiaCountryMexicoCountryChinaCountryAustraliaCountryPolandCountryIranCountryCategories20x102mmAircraft gunsMilitary equipment introduced in the 1960sMulti-barrel machine gunsRotary cannonUnited States Marine Corps equipment