There is no way a weapon like that is allowed in a range in the NYC Metro area. NYC ranges are all indoors and generally (but not always) pistol only.
I know in Long Island they would not be allowed on the public ranges. Not legally banned so much as against the rules of the range. The only public range in NY’s Nassau County bans full jacket ammunition because it rips through the backing. .50 BMG poses a public hazard to the one in Suffolk County because it is not sufficiently isolated from residential areas for such weapons.
My guess is if he does use it in NYS, its upstate, in an area with a lot of space.
