SUPER SHORTY???
maybe it can replace the GayS-23
also base a model off of this gun:

it's the STG45, was never put into production.
It was made to replace the STG44 with a cheaper, recoil-operated weapon.
But it has a low ass rof of 350-450 RPM irl
maybe you can make an oldschool-looking accuracy assault rifle with AK-level power