A minigun is a multi-barrel machine gun with a high rate of fire, employing Gatling-style rotating barrels. It was a standard military weapon before the Great War, with Rockwell's CZ series being the most popular choice in the United States of America.
A Rockwell CZ53 personal minigun is capable of firing 5mm ammunition at over 60,000 RPM with an ammo capacity of 120x 5mm round. 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. Later models of the CZ53 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. The first model was the favorite weapon of the Mariposa super mutants during the Unity's time.
Rockwell designed the 5mm CZ57 Avenger as the replacement for their aging CZ53 personal minigun. The Avenger's design improvements include improved gel-fin cooling and chromium plated barrel-bores, giving it a greater range and lethality. It also has an ammo capacity of 120x 5mm round like the earlier versions of the CZ53 model. Later models of CZ57 have a high-speed motor, a cage underneath to put the ammo box and used in combination with a backpack.
A variant model of the regular CZ57 Avenger minigun seen in the Midwest which is more compact, completely black, less powerful and chambered for 5.56mm bullets with an ammo capacity of 120x 5.56mm round.
A variant model of the regular Vindicator minigun seen in the Midwest with a completely new design, a display screen that show the remaining ammunition and chambered in 7.62mm bullets with an ammo capacity of 100x 7.62mm round.
An extremely rare minigun, the MEC Gauss minigun was designed by the Chinese. Atypical for an automatic weapon, it uses Gauss technology, multiple electromagnetic fields to firing 2mm ammunition at over 90,000 rounds per minute to relativistic velocities, with an ammo capacity of 80x 2mm round.
A post-War minigun designed by Vault-Tec in the Secret Vault. The Vault-Tec minigun has a lower rate of fire than a general minigun but, unusually for a minigun, chambered in common handgun ammo. It has five barrels and it was used by the Attis army in Texas.