Police were patrolling the area of 144 Columbia Road in Dorchester when they observed a vehicle that had the wrong registration information, Boston Police said.
When officers tried to conduct a traffic stop, the driver of the vehicle failed to comply. When police eventually did stop the car and search the driver, they saw a firearm fall from his leg area.
The recovered gun was a .380 Ruger loaded with one round in the chamber and five rounds in the magazine, police said.
The 13-year-old is expected to appear in court on several charges including unlawful possession of a firearm, operation of a motor-vehicle without a license and refusal to stop for a police officer.
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