The Q-Lock solves all your hopper issues. Open the quick release lever, insert the hopper, hand-tighten the thumbscrew and then close the lever. No tools needed. The Q-Lock has an abrasive internal surface to securely hold any hopper in its place. The Q-Lock is currently available for all Smart Parts markers and the Proto Matrix Rail(TM). The Q-Lock also fits most center feed Spyder and Piranha markers with an adapter.