The M1 carbine is a unique option at br2, a 30 round m1 would be a great choice for br3. at least two people have suggested this but the last was over a year ago. i would love to see some coemption for the germans own 30 round br3 carbine.
I think it was mentioned in one of the Making Enlisted a Better Place editions, that they’d do something like that but didn’t have the infrastructure or time, or something along those lines.