Yup your buddy was right about the hi cap magazine ban. It will continue to be a Felony in NY, even if the federal law goes away.
NY Penal law section 260
23. "Large capacity ammunition feeding device" means a magazine, belt, drum, feed strip, or similar device, manufactured after September thirteenth, nineteen hundred ninety-four, that has a capacity of, or that can be readily restored or converted to accept, more than ten rounds of ammunition; provided, however, that such term does not include an attached tubular device designed to accept, and capable of operating only with, .22 caliber rimfire ammunition.
NY Penal Law 265.02
(8) Such person possesses a large capacity ammunition feeding device.
Criminal possession of a weapon in the third degree is a class D felony.