If I remove the ball from the liner lock in a knive, does that knife come under the definition of a "gravity knife"? You know that if the ball is removed, that the blade can FLY out as fast as you can flick your wrist. I've seen manual knives become faster than automatics, especially if they have teflon bushings! The knife loses its safety mechanism when the ball is removed, so you have to be careful, of course. I wouldn't know about any of this from personal experience , just heard it from a friend. I want to know about the legal aspects, though.