And an AR lower is transferred as OTHER .... it is simply a receiver, it is NEITHER a pistol or a rifle when stripped and sold as new.
I don't know about that. My dealer sold my colt 6920 as a "long gun" aka rifle. Yes you are correct, a lower stripped would sell as "other" but I don't know what they would transfer a complete lower with buffer tube and all. A dealer would have to chime in on that.