You'd need subsonic ammo, but yes.
my x-girlfirends father was a navy guy(some kind of special forces type of guy NOT A SEAL but some kind of guy that boards other ships i think), he has a personal regular MP5 it was pretty nice.. also that guy was a monster... he was only like 5'7" but he was HUGE! forearms like popeye and arms like Ahrnold! :)