stagpanther said:
Sharkbite said:
Yep, as long as you have ONE pistol legal lower you could have 100 different uppers to use on that 1 lower.
The only issue is if you had ZERO pistol legal lowers and even 1 pistol upper. Now the Feds can say the only use you had for that upper was to put it on an UNREGISTERED rifle lower, thus creating a SBR without the tax stamp
That is the basis of "constructive possession"
I figured that was the case--and I assumed was implied in the way it's written--it's just that I don't remember seeing anything that expressly says you can switch pistol configurations as well.
Sharkbite is 100% correct, and it has nothing to do with switching pistol configurations. It simply has to do with whether you're in constructive possession of an SBR or not. Here is
ATF ruling 2011-4 that addresses what constructive possession is.
Notice the two key points of that ruling: In order to be in constructive possession of an SBR you must have the parts to assembly that SBR and they must be in "close proximity" to each other with no other "useful purpose" for having them. The phrase "useful purpose" is pretty clear; if you have a short-barreled upper and just a regular rifle lower lying around, the only "useful purpose" for that short upper is to be installed on the rifle lower, making it an SBR. But if you also have a lower that could be used as a pistol, one could argue that you do have another "useful purpose" for that upper: It could also be used on your pistol lower to make a pistol.
There's no theoretical limit on how many short uppers would be required to surpass this "useful purpose" requirement. In theory, you could have one rifle lower, one pistol lower, and 1000 short uppers that were for that pistol lower. Since the pistol lower gives you another "useful purpose" for having those short uppers, ruling 2011-4 says you can't get in trouble for constructive possession.
But at the same time, having no other useful purpose isn't by itself enough to meet the requirements for constructive possession under 2011-4; the parts must also be in "close proximity" of each other. So you could have 1000 short uppers and one regular rifle lower and no pistol lowers or SBR lowers to give you a "useful purpose" for having those uppers, and you still wouldn't be in violation if no short uppers were in "close proximity" to the rifle lower.
Now, the real question is what does "close proximity" actually mean. Some people think it means in different rooms. Some think it means on different floors. Some think it means in different houses. But as far as I know, there are no court rulings or ATF determinations on what it means exactly. I once asked an ATF Industry Ops guy what "close proximity" meant, and he told me to ask a lawyer.