It appears to be based on the M134 Minigun. The M134 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 attack and fighter aircraft.
However, the description lists the weapon as "Russian," indicating that it could take some inspiration from the GShG-7.62 rotary cannon.
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 18.104.22.168 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.