The Rockwell CZ53 personal minigun is capable of firing 5mm ammunition at over 60,000 RPM with an ammo capacity of 120 5mm rounds. The CZ53 personal minigun makes up for the small 5mm round by sending a hail of bullets toward its target. Its sheer size, coupled with its trademark sound, is enough to send anyone in its path running for cover. It's a great weapon for suppressing fire, letting others flank the unsuspecting enemy. When the Great War struck, it was already an aging design and was slowly being replaced by the more advanced CZ57 Avenger minigun. Other minigun models have six barrels linked into pairs, with four barrels on top and two on the bottom, a cage underneath the weapon to hold an ammo box containing 240 5mm rounds, and used in combination with a backpack. These miniguns were the favorite weapon of the super mutants during the Unity's time and allowed most or all of the super mutants to wield them effectively with only one arm.
The hardened minigun is an improved belt fed Gatling-style machine gun with six rotating barrels featured in Fallout Shelter. Dealing 19 minimum damage per attack, it has the second lowest damage output for a heavy weapon in the game.