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In most states 80% kits do not need to ship to an ffl. Unfortunately this is not the case in New York state as 80% kits are completely banned in the state. And may not be owned by residents. Its under the accessories section " ✘ Unserialized 80% frames or receivers are prohibited." https://www.budsgunshop.com/feeds/state_reg/new_york_restrictions.pdf And as far as parts for these (incase you end up moving to a free state) most all parts for a Glock 20/21 will fit these as that is what the frame is designed after, and Glock parts are everywhere online and in person so yes the additional parts you'd need to complete your build are easy to get.
Athanasios, unfortunately NY restricts Unserialized 80% frames or receivers. New York Safe Act did a number on many firearm/accessory restrictions : https://www.budsgunshop.com/feeds/state_reg/new_york_restrictions.pdf