In Canada a gun might be banned as an “assault” weapon when a slightly different version of the same gun is still legal with the only difference being that one of the guns is painted black, and the other (still legal) has a wood coloured stock. One looks like a “military” gun while the other one is a “hunting” rifle when in reality they are exactly the same weapon and the only difference is cosmetic.

I am all for sensible gun regulations but that is almost never the case in practice.