I read a lttle more at 922 and it seems he is right. BATF transportation laws get in the way of this and make it illegal.
922 is not written like that though. Only things you CANNOT do are on there and the exceptions.
Here is an exert from it;
(b) It shall be unlawful for any licensed importer, licensed
manufacturer, licensed dealer, or licensed collector to sell or
deliver -
(3) any firearm to any person who the licensee knows or has
reasonable cause to believe does not reside in (or if the person
is a corporation or other business entity, does not maintain a
place of business in) the State in which the licensee's place of
business is located, except that this paragraph (A) shall not
apply to the sale or delivery of any rifle or shotgun to a
resident of a State other than a State in which the licensee's
place of business is located if the transferee meets in person
with the transferor to accomplish the transfer, and the sale,
delivery, and receipt fully comply with the legal conditions of
sale in both such States (and any licensed manufacturer, importer
or dealer shall be presumed, for purposes of this subparagraph,
in the absence of evidence to the contrary, to have had actual
knowledge of the State laws and published ordinances of both
States).
Its pretty much cut and dry after you read it like seventeen times
. The only way you could aquire an AR type firearm from an out of state FFL, is if that FFL read and understood all of NJ firearms laws and agreed that it is indeed legal. I believe I saw an exception there for frames and receivers, but I didn't read much of it.