Something I learned while reading the Q&A at PSA. When you choose a lower get one that was manufactured as a pistol. Apparently in a serial # record check there is a difference. They say you can make a pistol lower into a rifle but not a rifle lower into a pistol. Just sayin I read this, not I can or will defend this.
All striped lowers will be transferred as a firearm, not a rifle or pistol, similar to say, a mossberg shockwave