I almost made this mistake once. Was at a sporting goods shop in PA. They had a BB pistol with a shoulder stock that shot semi or 6 round bursts. Thought it would make for a fun toy and was ready to buy it until i remembered NJ classifies them as firearms.
That was pretty much THE point in time when it dawned on me just how ridiculous the gun laws are it this state. Buying an over the counter BB gun in PA would have turned into possession of a high capacity magazine, an sbr, and a machine gun as soon as I stepped foot back in NJ