ABERDEEN, Md. (WJZ) -- A Harford County man was charged in the illegal sale of a regulated firearm.

Maryland State Police troopers served 37-year-old Keith Robert Langenfelder Jr. of Aberdeen on Wednesday with a criminal summons on firearms-related charges.

The summons charged Langenfelder with the unlawful sale of a regulated firearm, selling a regulated firearm without a license and the illegal sale and transfer of a regulated firearm.

State police with Bel Air Police Department learned in March of information that led them to start a investigation into Langenfelder. They learned that the suspect allegedly sold a regulated firearm to someone who's prohibited from possessing a firearm.

At Langenfelder's home, they seized eight additional firearms.