Already a thing.
Any gun has a purpose of defense. Plus AR-15 (I assume you are talking about that one) is a glorified hunting rifle that is made to look like military one, but has all the technical capabilities of a basic hunting rifle. Pretty mediocre one too. Its just the dumb housewives or uneducated liberals who want to ban it because it kinda looks like M4A1 and to them it looks like "scary "military assault weapon". So my point still stands, advocacy for gun control isn't grounded in logic and reason, it is purely based on appeal to emotions of segments of society that are least educated on the issue.or things like banning types of guns that does not have the purpose of defense?