.308 Retractable Twist Pen Display with 12pcsDisplay with 12 . 308 Retractable Twist Pens . 308 Retractable Twist Pen Your signature is "mark". Make your mark loud and proud with a Genuine . 308 Caliber Brass Shell Casing once fired by and procured from the US Military! Pen ink can be replaced with CROSS style 8514 2 ball point pen refill. Pen comes with ink replacement instructions and our signature care card. Although our products do not contain any active gun powder or primers making them