Grappling Hook Launch Cannon
Christian Reed made this Instructable that shows us how to build a Grappling Hook Launch Cannon. Where was this Instructable when I couldn’t find my ladder last week. 🙂 “The final version begins with the CO2 coming from a paintball cylinder.  It enters the gun through a check valve (to ensure it does not come out once it enters the tank) and then a Quick Exhaust Valve (QEV).  The tank