M197 Gatling gun
The M197 Gatling gun is a variant of the 20 mm M61 Vulcan Gatling gun. The M197, which is carried by the AH-1 Cobra and its variants (including the SeaCobra and SuperCobra series) and the OV-10 Bronco, utilizes only three gun barrels as opposed to the Vulcan's six. Using a linkless feed, the gun can fire 750 or 1,500 rounds per minute. The weapon's current contractor is General Dynamics Armament Systems.
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