It takes only a few minutes to replace the dust cover with this solid aluminum mount. Clamps to frame with internal steel rails; provides a rock solid base for mounting even the largest scopes. Picatinny-style rail provides optimum mounting flexibility for scopes or electronic sights. Fits inch- and metric-pattern receivers. Mfg: D.S. Arms SPECS: Aluminum, matte black finish. Accepts Weaver-style rings. 8.5" (21.5cm) long. 11 oz. (313g) weight.