From the NYS SAFE Act:

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 (A) has a capacity of, or that can be readily restored or converted to accept, more than ten rounds of ammunition, OR (B) CONTAINS MORE THAN SEVEN ROUNDS OF AMMUNITION, OR (C) IS OBTAINED AFTER THE EFFECTIVE DATE OF THE CHAPTER OF THE LAWS OF TWO THOUSAND THIRTEEN WHICH AMENDED THIS SUBDIVISION AND HAS A CAPACITY OF, OR THAT CAN BE READILY RESTORED OR CONVERTED TO ACCEPT, MORE THAN SEVEN 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 OR A FEEDING DEVICE THAT IS A CURIO OR RELIC. A FEEDING DEVICE THAT IS A CURIO OR RELIC IS DEFINED AS A DEVICE THAT (I) WAS MANUFACTURED AT LEAST FIFTY YEARS PRIOR TO THE CURRENT DATE, (II) IS ONLY CAPABLE OF BEING USED EXCLUSIVELY IN A FIREARM, RIFLE, OR SHOTGUN THAT WAS MANUFACTURED AT LEAST FIFTY YEARS PRIOR TO THE CURRENT DATE, BUT NOT INCLUDING REPLICAS THEREOF, (III) IS POSSESSED BY AN INDIVIDUAL WHO IS NOT PROHIBITED BY STATE OR FEDERAL LAW FROM POSSESSING A FIREARM AND (IV) IS REGISTERED WITH THE DIVISION OF STATE POLICE PURSUANT TO SUBDIVISION SIXTEEN-A OF SECTION 400.00 OF THIS CHAPTER, EXCEPT SUCH FEEDING DEVICES TRANSFERRED INTO THE STATE MAY BE REGISTERED AT ANY TIME, PROVIDED THEY ARE REGISTERED WITHIN THIRTY DAYS OF THEIR TRANSFER INTO THE STATE. NOTWITHSTANDING PARAGRAPH (H) OF SUBDIVISION TWENTY-TWO OF THIS SECTION, SUCH FEEDING DEVICES MAY BE TRANSFERRED PROVIDED THAT SUCH TRANSFER SHALL BE SUBJECT TO THE PROVISIONS OF SECTION 400.03 OF THIS CHAPTER INCLUDING THE CHECK REQUIRED TO BE CONDUCTED PURSUANT TO SUCH SECTION.