@Qwert64,
No there is non such DL and serial number requirement and if they ask for it, do as I have, you tell them so and take your trade away.
In general in NJ
The FID and pistol permit can take anything from 30 days to 6 months entirely dependant upon your local cop shop. Call regularly and politely once a week after the official 30 days are up and it will be processed quicker if only to stop you irritating them.....
When asked, and you will, what you want to do with firearms do NOT EVER say home defense or such like. Target, hunting, sport etc will be a far better idea.
Hollow Point ammo issue has been mentioned before, if you are concerned and want a better stopper for home defense, I suggest EFMJ.
AR-15's that are NOT Colt are OK, if you really want to confuse them do what I did and buy a Robinson Arms XCR, looks superficially like an AR-15 EBR but with a piston system, AK style ejector etc......I've had fun with that I admit...
NO FOLDING OR COLLAPSABLE stocks, 'cause as we know they make any rifle infinitely more evil.
You can have almost any weapon or a close facsimile therof, it's just a PITA.
However, by being a PITA, you will at least in some small way be contributing to the good fight in NJ.