As indicated above, in Nebraska, a purchase permit is required by State law to transfer a handgun, and as I understand the law, anything that transfers as an "other" also requires a purchase permit as it is NOT a longgun.
Three buyers were ready to buy stripped lowers, I had to decline all three as no permits.
While I suppose its possible, ATF *could* run a sting like this, I very seriously doubt that is the case in these instances, besides, its NOT a Federal law anyway, so as far as ATF is concerned its State issue NOT theirs.