I purchased a few AR stripped lowers, and I am considering building one as a pistol. My question is, do I have to re-register the lower reciever or can I build it without any further paperwork. When I ordered the multi-pack of lowers, and the FFL transfer was as rifle lowers, no pistol paperwork. I do have a CPL, I just don't know what the process would be if there is one. I've built an AR before, but as a rifle, this is my first time even considering going this route.
Thanks!