the part with thompson center is a touchy issue still even with legal precedence proving we not the gov't are in the right, but they can still throw you in the pokey and force you to go through a long legal process even if you are still found to be right...
for that part i always have a rifle config and a seperate receiver in a pistol config for my own piece of mind.
same is with my AR's until i did go get one of my lowers registered as an SBR... even though i had 2 lowers that were labeled as pistols...
i choose not to take chances with having to deal with the BATF even if i am in the right... you can't argue with STUPID even thought you are right... only lawyers in a court of law can argue the points and prove you are right... sad but true.
Lifetime member VFW and NRA
"Quando Omni Flunkus Moritati" (when all else fails play dead) -Red Green