Then I'm in deeper doo doo than usual. The way I read the laws, as long as I do not make an "assault weapon" out of my AR 80% casting, i.e. keep the evil features down to two, I'm fine. No registration required on non-ass gun rifles. And NICS is only required when purchasing.
Pistols may be another story. I'm just about ready to take the leap & buy one of William's "Tannery Shop" 1911 castings. If I understand his ad correctly, he's done all of the drilling & tapping. All that remains is to mill the slide rails. Even I can do that. :) NJ's pistol permit is for purchasing. I brought several handguns into NJ from NY, where I lived for 22 years. The Sgt. in the firearms division in Trenton just said, "Bring 'em on in. No registration required". Because they were legally purchased in another jurisdiction. After all of the NJ stories I'd heard, that was a scarey thought. At least in NY, I had a permit to carry with me. In NJ, nada.
I'll have to do some more reading on the "homemade" pistol laws. Maybe even call up the NJ firearms division again. He was pretty friendly & seemed to be knowledgable.
Best of luck,
Norm