If you are really concerned, you can buy a lower that was marked "pistol" by the manufacturer. Logged into their books as a "pistol". Logged in at the FFL as a "pistol". Then transferred to you on the 4473 as a "pistol". This should reduce the chances of there ever being confusion about the fact that what you bought was indeed a "pistol". I know it's not all strictly necessary, but will certainly save time in the event any questions arise.
I did that through Sun Devil Mfg. for a pistol build to let me take my SBR upper out of state without having to file a form 5320.20 every time I wanted to go out of state with a 10.3" barrel. It even wears a bullet button and 10 round mag for California use.
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