It appears to be based on the Glagolev-Shipunov-Gryazev GShG-7.62 rotary machine gun. It is considered a machine gun due to firing projectiles smaller than 20 mm, as opposed to larger projectiles that would be fired by automatic cannons (autocannons). Autocannons are commonly found on military aircraft, especially fighter jets and attack aircraft.
The GShG-7.62 unlike the M134 minigun is gas operated and does not require a power supply to function explaining why it requires no power supply to function.
The slight delay before firing can be attributed to the motor activation for the barrel rotation mechanism.
Real rotary multi-barreled machine guns have essentially no delay between firing and when the trigger is pulled
"Hell's Fury" was the name of a laser minigun in Deadzone.
The 22.214.171.124 patch changed its ammo type to High Caliber Ranger Ammunition and simultaneously reducing damage against barricades and structures to 9 points of damage.
This change was reverted in a subsequent patch which overhauled all non-curated machine guns.