New York City’s ban on rifles and shotguns that hold more than five rounds is now being enforced, according to a letter the NYPD is sending out to targeted city gun owners.

“It appears you are in possession of a rifle and/or Shotgun (listed below) that has an ammunition feeding device capable of holding more than five (5) rounds of ammunition. Rifles and shotguns capable of holding more than five (5) rounds of ammunition are unlawful to possess in New York City, as per NYC Administrative Code 10-306 (b).”

“You have the following options,” the letter explains....