The crime happened back on April 29th at 2:50 a.m. in the store at 758 East Johnson Highway.
Investigators say a man walked into the store and held the clerk at gunpoint, demanding he open both cash registers.
The suspect then took cash, cigarettes and an energy drink. A second man was seen outside acting as a lookout.
The man who entered the store is described as a black man in his late 20's, about 5'8" to 5'10" tall, weighing about 140 pounds. He had a beard and mustache and was wearing a dark hooded sweatshirt with white sneakers.
The man who stood outside the doors is described as a black man, approximately 5'11" and 140 pounds. He was wearing a gray hooded jacket.
Anyone with information is asked to call the Norristown Police Department at 610-270-0977.