I checked with the sheriffs and state police and this is there anser.
"A magazine in the state of NY can only be able to hold 10 rounds"
When I asked about altering a large cap mag to only hold 10 rounds I was told the same thing.
When I asked if the change had to be permanent I was told the same thing!
So allot of help they were
So I will tell the retailer just to buy after market mags or wait for the 10 round ppq mags to come out.