Question
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Six months might make you a temporary resident in the eyes of some rules, which can change your obligations. Worth a quick consult with a NY attorney.
Smart instinct to leave the questionable ones home. NY's 'assault weapon' definition is feature-based and the penalties are serious, so when in doubt, don't bring it.
I'd bring the absolute minimum, a basic hunting setup and nothing feature-questionable. Not worth a felony over a work trip.
Your standard handguns and traditional hunting rifles/shotguns are usually fine, but NY also has handgun licensing that's county-specific and a pain. Look into that before you bring pistols.
Magazines are the other trap, NY caps capacity. Leave the high-cap mags at home with family, no exceptions.