i see it more as a modern looking tommy gun
Closest real life matches I can recall is either: M3 "Grease gun", AS VAL, Sten Mk2/3, or an extened TEC-9 with skeltal stock and barrel modifications.
fray makes the shells fly and cray spawns it
it was pretty easy just some aray for the shooting and cray, fray for the shell ejecting
awesome +1 how did you make it