I think I know the answer, but want to make sure.

If you have an AR that was originally built as a pistol, later converted to an SBR by a tax paid stamp, can you remove the stock to cross state lines?

Same line, could you swap uppers to a 16+ and have the short upper in the vehicle, and be in compliance? (Not stored together)


Sorry for the mundane questions, just a discussion among friends and we were divided almost equally.

Yes, it’s only an SBR when it’s in a short barreled configuration with a stock. As for in your vehicle, that will depend on state laws.

I'm not a lawyer, but from everything I have read on the subject the answer is yes.

Man. You could really get into the weeds with this question. As others have said, yes, with a 16” barrel it is no longer an SBR. The thing with both uppers in the car is not as simple. Recall the Thompson Contender ruling “Possible configurations”? You have a 16” upper, an SBR upper and a single lower. Is a form 20 out of the question?

ETA: Nevermind. See it is a thought exercise.