Well considering you cannot get in in NYS and they are hard to comeby expensive in new york. Upwards of 2k.
There is a company, i forget the name currently that specializes in customizing regular glocks into auto glocks, i will find it again if you truly desire.
A basic New Glock 17 in 9mm will run you about $900, but you need to be 21 with a pistol permit
there’s plans on the net for the conversion of glock 18 and 19’s to semi and full auto. the parts replace parts in the firearm so there is no permanent modification to the frame.
Its honestly just an assload of paperwork and patience, go to your local gun store, and ask for all the paperwork required for a pistol permit, fill it out send it in, wait 6 months to a year. Then when you get a gun you ahve to register the gun, and register it ONto your permit. Dicks, Gander Mtn are not the places to go. You need to go to a real gun store that deals in pistols. Your local shop is best
negative. the 18’s could fire three round busts. they are not fully auto unless modified. the 18’s do not share many of their parts with 17/19’s, for obvious reasons. these were military/law enforcement only weapons.