Single side design helps eliminate ejection interference. Front deflector shield protects the lens from blast residue. Attaches to the dust cover using five screws for rigid mounting. Includes a removable thumb rest. Accepts C-More Railway and C-more Slide ride sights ONLY. Mfg: Allchin SPECS: Aluminum, matte finish. 4.5" (11.5cm) long. 1.7oz. (48g). Includes screws and instructions. Gunsmithing fitting recommended.