Indyfreak - reading the proposed NY law it appears that citizens will not be able to possess magazines holding more than 10 rounds. Magazines holding more will become contraband and would have to be turned into the police or disposed of.
Further, after one registers his rifle, he will then receive a form letter from the local PD warning him that possession of mags holding more than 10 rounds is a no-no.
I have no reason to doubt that the form letter warning will also go to every registered handgun owner in NY state.
They WILL put gunowners on notice.