It's now illegal in New Jersey to sell or posses a "bump stock," the controversial firearm accessory allegedly used by the gunman in last year's Las Vegas massacre.

Gov. Chris Christie, a Republican set to leave office Tuesday, signed a Democratic-sponsored bill Monday outlawing the devices, which can be affixed to semiautomatic riffles to allow them to fire bullets, mimicking automatic weapons.

Christie -- who took action on more than 150 bills on his final full day in office -- made no statement on the legislation (S3477/A5200), which takes effect immediately.

Anyone who owns a bump stock or "trigger crank" now has 90 days -- until April 15 -- to surrender the accessories to law enforcement authorities. Retailers who sell them have 30 days.

Sale or possession of a bump stock is now a third-degree crime that carries a sentence of three-to-five years in prison, a fine of up to $15,000, or both.