A device for marking the external perimeter of ammunition. The device includes an outer case with an interior portion which includes a plurality of circular rollers that are position to create a recessed channel for ammunition to be placed into. The outer case is equipped with a crank, which is attached to a spindle, which controls the rotation of the circular rollers. One 360-degree rotation of the crank rotates the spindle and the ammunition. The outer case includes a lever attached to an external side of the outer case. The lever is attached to a holder which holds a plurality of marking instruments. When the lever is depressed, the holder and the marking instruments are lowered on to the external perimeter of the ammunition. While the ammunition is rotated, the marking instruments mark the external perimeter of the ammunition. After marking, the ammunition is ejected through the openings in the outer case which are aligned with the recessed channel.