PSA multi cal lower

[MaineAR]

It has nothing to do with how PSA classifies their lowers when they ship to you. It has EVERYTHING to do with how your FFL filled out the 4473 and reported what you bought to the ATF. If your FFL isn’t savvy, they may have checked that it was a rifle in box #27 if it had a stock when you bought it. But, if they said “receiver” or “other”, you are fine as there is no firm description of the firearm. If you did have it checked as a rifle on the 4473, then you putting the pistol upper on it and swapping to a brace is a no-no. You can’t go from a rifle to a pistol.