OTF (Out the Front) pocket knives are huge on the market right now. Ever since the ban on selling and owning switch blades in the 20th century, knife enthusiasts have been looking for something similar ever since. The closest we've ever gotten to switch blades are the spring assisted pocket knives, but these knives open from the side and aren't as quick to open compared to the switch blade. OTF knives are essentially the modern legal substitute for switch blades. However, be sure to check your state laws pertaining to OTF knives, as they are still illegal in Washington, Montana, Minnesota, New Mexico, Maryland, Virginia, Pennsylvania, and Massachusetts.