This is why I specifically said 'lower' :-) But you are correct.... as usual...
You can use a the fullauto bolt/carriers in your Title 1 weapons with out being in violation... BobCat Weapons, the guys that make the kick ass copy of the MP5... they all ship out will full auto bolts and carriers... BobCat tests them on full auto before the ship them out (they remove the sear and FGC beforehand).
VUPDBlue: You should give
www.uzitalk.com/forums a shoot. Its a VERY will designed place almost ENTIRELY setup for NFA... Not just Uzi's... Most of the big guys and manufacturers are there too.