I mean still unusual for most areas of US. Only time I’ve seen the police carbine irl is when a veteran in my college dorm had a mental breakdown and holed up in his room with a gun. He ended up getting arrested peacefully enough but idk about follow up. This was before mass school shootings were so prevalent. His roommate was also a schizophrenic who stopped taking his meds and also dropped out. Shame for both because they were decent acquaintances otherwise.