Criminal possession of a firearm is a class E felony, if you are convicted the maximum possible prison sentence that you will receive is 4 years. New York City accepts tips about illegal firearm possession and trafficking through the Gun Stop Program.A law prohibiting minors under the age of 16 from possessing certain weapons, including air guns, spring-powered guns, and dangerous knives. If you are facing gun charges, or have been arrested for a weapons offense in New York City, contact our gun crime lawyers for help today. Defending You Against Serious Weapons Charges. New York's gun and weapon offense penalties are among the toughest in the nation. New York prosecutes firearm and gun crimes zealously and has some of the strictest possession laws in the country. There is no criminal possession of a weapons statute for regular ammunition. There is no criminal possession of a weapons statute for regular ammunition. Possession of Firearms and Crossbows.