There a continuing discussion on the site regarding the purchase of AR pistol lower receivers. As I understand it, any virgin AR lower receiver may be built up into a pistol, as long as it really has never been a rifle.
Here in PA, there is a separate procedure for buying a pistol that requires exxtra paperwork. I ordered 10 Stag Arms lowers, and they are at my dealer. I have so far transfered 3 to myself, and they were transferred as pistols. They were entered into the dealer's bound book as pistol receivers, they are on the 4473 as pistol receivers, and I filled out the separate pistol transfer form required by the PSP for pistol sales.
My plan is to have the gunsmith mark each of the 10 receivers with the word "Pistol" and transfer the remainder of them in the same fashion as the first three.
My presumption is that once this is done, each of the receivers will be lawful to builld a pistol or rifle on, much in the same way that a Thompson Center single shot carbine can be switched back and forth, even if you buy the parts initially to build it into a rifle (and transfer the receiver to you as a pistol).
Am I missing something here? Or should I just send a letter to the ATF for a determination?
Here's the Thompson cite, if anyone is interested:
supct.law.cornell.edu/supct/html/91-0164.ZO.html