41-year-old Andrew Kuklis of Patchogue was driving on the Southern State Parkway in Islip Friday night when troopers pulled him over for a traffic violation.
Officers say they found marijuana, a loaded handgun, a dagger, and high-capacity magazines during the traffic stop.
When troopers searched his home, they found a revolver, a handgun, a rifle, and a large quantity of various ammunition.
Investigators charged Kuklis with criminal possession of a weapon and other charges.