Volquartsen 10/22 Barrel Mounted Picatinny Base A Picatinny spec scope mount designed to mount directly to .920" bull barrels. Also Weaver compatible, the mount cantilevers back over the receiver and utilizes one tension set screw in the rear of the mount for stability. The idea is to ensure that the scope will always be in alignment with the barrel because the mount is attached directly to the barrel. All Volquartsen bull barrels for the 10/22 will come drilled and tapped to accept this scope mount. (If your barrel is not a Volquartsen and requires drill and tap 2 Holes - Call 800-950-9088 - We can install it for you). Click Here to see all of our Ruger 10/22 Scope Mounts and Scopes!