PSA multi cal lower

[FLshooter]

Question: If a lower is transferred to you as an "other" then what does the ATF care what it is at any time? It is always an "other" lower in whatever configuration they find it. They care a lot when a lower registered as a "rifle" when first transferred to the original owner is found in short configuration.

The ATF has no clue how you build your "other" lower - at any time you own it, unless you provide pictures and words in print to the contrary.

The only lower you may build to a shorter than rifle length pistol is one that was originally transferred to you as an "other". I don't know if there is an option to register a lower as a "pistol", I don't believe there is.

Rule: If a lower was originally transferred and registered as a "rifle" then it is always a rifle lower, period. If a lower was originally transferred as a "other" lower, then it can me bade (built) into any configuration the owner so desires, providing they can prove they are following the rules and standards they change at their whim.

Do not build a lower you buy privately as a pistol. Ever. Period. Buy a stripped lower or pistol built lower, have it transferred to you as a new receiver as the original "owner", then carry on in any form you wish.

Here in Florida we aren’t required to register Firearms.“Other“ means I Purchased it as a new lower. My FFL told me that ATF has no clue on what I did my receiver. So I can switch it back-and-forth as many times as I’d like.
I asked this question, just to get opinions.But I have other AR builds that started with a stripped Anderson or Aero lower.And I also have 80% lower builds.I just wanted to use one of these PSA lowers because I had already stripped them and it was more convenient. But if need be I could have used the other options.