Built with a deployment mechanism that will remind you of the bolt action on a rifle, the Nitecore NTP31 Aluminum Bolt Action Tactical Pen is both a writing implement and a piece of survival gear. Slide the lever forward to extend the writing tip; slide it to the rear, and a tapered tungsten tip emerges from the other end, ready to break a window or to be used in self-defense. The machined-aluminum pen, with a finely-knurled grip section, accepts Schneider ballpoint refill cartridges, and is fitted with a stainless steel pocket clip. The NTP31 comes in a handsome presentation box.