Tcp is right about limits.
New York limits any person to putting seven rounds of ammunition into a magazine, unless the person is at an incorporated firing range or competition recognized by the National Rifle Association or International Handgun Metallic Silhouette Association, in which case the limit is ten rounds.Oct 23, 2018
If he ordered handgun which doesn't comply with restriction, nobody is going to send to NY FFL.
I've got the same in Cook County, IL and few cities around me.