[Sacajaweau]

IIRC, There is an exception in the law...for pre-owned guns.

[Blue Jays]

"...exception for pre-owned guns..."

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Dana Loesch covered this very unfortunate New Jersey legislation.
Age of manufacture is of no impact.
If one has a Beretta, Glock, or SIG from 1998 (for example) with 12-round magazines, that person is still a felon.