Certain high capacity magazines over 50 years old can be still be purchased and registered as antique magazines.
Penal law 265
. 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.