The Mega Mech Gatling Gun was a weapon designed and manufactured by DB Industries. These large caliber gatling guns resembled the older Chain Gun, but on a much larger scale.
The gatling gun was built specifically for combat to be used by Mega Mechs, unlike the Industrial Staple Gun, which was originally used for construction purposes by Construction Mechs before being utilized as an effective improvised weapon against the Swarm.
In 42 A.E. Mega Mechs armed with Mega Mech Gatling Guns guarded the Government House in New Ephyra.
During the Battle of Old Ephyra, the mech piloted by Private Augustus Cole was armed with such a gatling gun.