The incident happened around 11:30 p.m. Tuesday at the 7 Eleven on the 19000 block of Leitersburg Pike. Police say the man entered the store and demanded money from the clerk.
The suspect is described as about 5'11"-6'0" tall, weighing 180-200 lbs. He was last seen wearing a green hoodie, black pants and black shoes. He also had a white shirt or scarf wrapped around his face, with light colored gloves on his hands.
Police say a black handgun was also possibly displayed before the man fled the store with an undisclosed amount of cash.
Anyone with information regarding this robbery should contact Senior Trooper McMullen with the Maryland State Police Hagerstown barrack at (301)-766-3840.