Weaver-style front base lets you mount electronic and optical sights and still retain the use of issue sights. Open center channel gives unrestricted view of sights; allows red dot and iron sights to be zeroed to the same point of impact. Provides clearance for M-4 and large diameter handguards equipped with integral flashlights. Mfg: Mounting Solutions Plus SPECS:Aluminum, black, anodized, matte finish. 10'''' (25cm) long. 4.1 oz. (115 g) wt. Fits A-1 and A-2 upper receivers. Accepts Weaver-style rings.