9mm carbines
I have 20 years of experience with the Colt 9mm smg/carbine , as a duty wpn, instructing it and working on them as an armorer. I had Colt SMg's in my inventory for two decades and they were great guns. From an instructor's standpoint, they were accurate & had basically the same manual of arms as the M-4 which I instructed also. From an armorer's standpoint, they ran well, and were durable. They IMO are a great firearm, in a carbine version one would serve you well.
I also have a RRA 9mm AR as one of my designated "house guns".
I have run several thousand rds thru it and it is accurate and very reliable....I run mine with an EO tech 552 optic and use metal form mags ( which is the best 9mm AR mag IMO).
Colt or RRA will serve you well.