A 30mm chain gun is a type of automatic firearm that uses a chain-driven mechanism to feed ammunition. It typically fires 30mm rounds, which are larger than standard bullets, allowing for greater firepower and effectiveness against various targets. These guns are often mounted on military vehicles, aircraft, or naval vessels, providing support in combat situations. The design of the 30mm chain gun allows for a high rate of fire, making it suitable for engaging both ground and aerial threats. Commonly used by military forces, it can fire different types of ammunition, including armor-piercing and explosive rounds, enhancing its versatility in combat scenarios.