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My father started the Korean war ( he was an NCO ) with a Tommy gun which he said was heavy and needed cleaning a lot. That was quickly taken away and he was issued an M-1 carbine, the fully automatic one. He like it a lot but said beyond 50 yards it's stopping power was greatly diminished. He said the .45 round was effective beyond 100 yards and would easily bring down a man at that range. He traded the M-1 carbine for a grease gun from a Sherman tank crew member, who he said was drunk at the time.

He LOVED the grease gun. He said he didn't really clean it very much, and it was much easier and lighter than the Tommy gun.

The Matell version was the best Christmas present I got in 1956.Burned through a roll of caps in about 5 seconds.

....He said he didn't really clean it very much....

A firearm with blowback operation does not need frequent cleaning (in an average environment). The blowback mechanism has quite large clearances.

I have a Hi-point .45 carbine. Blowback operation. Hi-point specifies that the new owner should not clean the rifle until after firing the first thousand rounds. Unless going into long-term storage, of course.