"How about just sending it back to the States?"
That not good enough.Not even close.I can't legally buy,or possess,a firearm in Massachusetts despite being a decent,sane law abiding citizen.OTOH I could,in many states (including Oklahoma) buy,possess and carry a firearm without a single bit of trouble or hassle.
Some states simply don't care...so certain inalienable rights and responsibilities shouldn't be left up to the states.