I've carried a variety of these in a back-pocket, one at a time. The following has happened with nearly all of them. I reach into the back-pocket of my pants to take it out . . . and sometimes only the cap comes out. One was a Fred Perrin Concepts pen with a rather weak snap-cap. All the others used threads. With the Hinderer custom pen, it's less of an issue; since most of the pen comes out of the pocket if the cap falls off. (Basically, you can still defend yourself quite effectively if needed.) However, with all of the other pens that use a threaded cap, the clip is on the cap. So only the cap comes out if you reach for the pen. Thankfully, I've only had to reach for my tactical pens to use them as just pens. Still, not a great feeling when only the cap comes out of the pocket. The threads work themselves loose due to sliding in & out of the driver's seat of the patrol vehicle. Do that a few times, and the pen has a tendency to work itself loose. Loose enough that the cap pops off when you reach for the pen in a hurry. I've had this happen with pens costing nearly $100, and with those under $25. Something to keep in mind if you prefer to carry a tactical pen in the back-pocket of your pants, and you often get up and sit down. As for me, I'm going to use a twist-action, metal, ballpoint pen. Doesn't have to be tactical to work well for self-defense.