NJ born and raised and I lived there for 31 years. I bought by AR in NJ and it was a regular Cirque du Soleil act to get it "NJ Legal". I had to pin the stock in place, and pin my Battlecomp, both at different gunsmiths. I had to stick to "low cap" mags even though every training course I went to in that state the SWAT guys who ran the class would hand us all a few 30 rounders for the duration.
NJ gun laws are beyond heinous. I'd put them right below Cali. You have NO 2A rights there. It's a privilege, and the application process is a mess.