Originally Posted by rmecapn
Is it legal for a non-FFL holder to ship to a FFL for transfer to another non-FFL? I have some lowers I would like to sell, but would prefer not incurring the additional cost of using an FFL on this end, if possible.
Yes, you can do that for both long guns and handguns as far as the law is concerned. That's the whole reason why the GCA of 1968 created FFL dealers - to facilitate interstate transfers.
As already noted, check with the receiving FFL on their policy. Some won't do it, other will do it but require that the "sender" enclose a copy of his driver's license so that the dealer has something to put in his file alongside the entry in his bound book that reflects where the gun came from to show the ATF inspectors.