I don't know much about guns but my impression is that rifles seem to be categorized likely use case (e.g. sport rifles, hunting rifles, assault rifles) and in

I don't know much about guns but my impression is that rifles seem to be categorized likely use case (e.g. sport rifles, hunting rifles, assault rifles) and in this case assault rifle seems to match both the use case he was talking about and also is an apt descriptor of the specific gun that led him to buy it. I don't really understand why assault rifle is inaccurate in this case.