It was kinda hard to decide on a category for this little contraption. The thingy could just as easily fit in the Deepest Depths of Uselessness category. But we suppose that, for the right user (who left his knife on his dresser), a Picatinny-mounted, spring-loaded glass breaker might come in handy from time to time. Even if it adds (we’re guessing here) eight or ten ounces to the front of your pistol and requires a custom holster. But don’t worry — if hanging one of these off the bottom of your gun crimps your laser-aiming or target-lighting style, it features its own length of rail so you can daisy chain a RailMaster under your window cracker. But if you double up like that, you’d better do a few more 12 oz. curls if you plan on toting that much hardware on the end of your G17. [h/t Chewbacca Defense]