Standard sks (fixed magazine) is legal to own, buy, sell, use...etc in NY- so a sale to someone here from out of state would be okay (gets sent to an ffl anyway). Bayonet is not an issue - becomes an issue only with versions that use detachable magazines ( Chinese 'D' model comes to mind).
Semi auto with detachable
mag is the main ingredient for determining if gun is an 'aw' under new law- the 'evil features' come into play then.
The new regs do not allow any
of the listed features (including bayonet lug), where the old law allowed one. Any semi auto gun with detachable
mag and any of the prohibited features can no longer be transferred into or within NY. (So a 'D' with a bayonet lug could no longer be sent here, but a lugless 'M' in a monte carlo stock could. Not in a thumbhole stock, though, that's another banned feature).
In order to keep any prohibited weapons already in possession- they must be registered with the state as an 'aw' by January next year.
Only exceptions to the sale or transfer prohibitions of an 'aw' are from an individual in the state to an out-of-state person (and therefore, most likely an ffl involved)or to an ffl instate (who cannot transfer to anyone in the state except law enforcement).
The law also exempts leo's from its provisions, but does not state exactly how a transfer to an leo should be done (but since all transactions have to go through an ffl for a background check now, that would be the likely way.)
Now- there is a provision in the law that says if you remove the offending features permanently
, then the gun does not have to be registered and can be sold, traded, etc in the state. You should see some of the truly ugly-IMHO- variants of the AR being shown around here.