Many years ago I was shown an item called a MAC Scatter.
It was a double shoulder holster designed to take 2 MAC 10 Ingram sub machine guns, they could be fired without removing them from the holsters. Basically it was tilt and go.
Good business for your tailor and the manufacturers of ammunition.
A MAC 10 is totally uncontrollable without the attachment sound moderator the weight of which holds the muzzle down, it has a cyclic rate of fire of 1100 rounds per minute firing the 9 X 19mm NATO pistol round.
The torch/alley broom looks based on the Glock semi auto pistol probably modified to fire full automatic.
Years ago I saw a chap with an old Luger that went full auto due to a fault developing in the disconnect mechanism; this was on an indoor range.
I changed all the light bulbs while he was in the toilet.
My avatar is a poor likeness.