Slip-Over Scope Mount for Ruger #1 Weaver Style Scope Base Slips Over Ruger No. 1 Rib Our new "Slip-Over" Ruger #1 scope mount solves the problem of aligning an after market scope base on a contoured barrel... It uses the factory pre-aligned rib as an alignment shim! Now you can have a precisely aligned Weaver style scope base on your Ruger Number One! Note: This will not work on Ruger No. 1 models with the 2 pc. scope base. Installation is Easy - Remove the screws from the original rib. It will stay in place with the recoil pins. Slip the Slip-Over Mount onto the rib. Install our replacement Allen head screws. Getting an aftermarket scope mount to align properly when mounted on a contour barrel has always been a challenge. Every one of them is a potential hand fitting job... But not with the Slip-Over #1 Mount! The machining is precise. The craftsmanship and finish are exceptional. And, the design is ingenious. Order Your Ruger #1 Slip Over Mount Today.