Pen kits only (blank not included) Option: 6 Pack Gold. With a barrel modeled after a 30 caliber cartridge and its miniature rifle clip, this pen will make a fine gift for any gun or hunting enthusiast. Add to that the fun factor of its bolt-action mechanism and you'll have a writing instrument that's tough to set down. The 30 Caliber Bolt-Action Pen Kit's precision components ensure that the refill advances and retracts smoothly, while promising excellent reliability. Pen blank not included.