This heavy-duty recoil base is designed for the Long Malcolm scope only.
Due to the heavy recoil of muzzleloader rifles, the Malcolm 6X long scope must be securely mounted to the rifle so that it does not move when shooting. If your rifle is predrilled, you can use the existing holes if they fit the hole pattern on the heavy duty base. Otherwise, two holes must be drilled and tapped into the receiver in order to install this base.
This base is included with the Wm. Malcolm 6X Long Telescopic Sight.
Due to the various receiver screw configurations, the base screws are not included. However, the most common screw sizes are 6-48, 8-40, and 8-32.