Abstract: A unitary metal base substantially rectangular shaped in planar configuration though having a curved upper surface in intermediate location provided with mounting screw holes therein to receive screws for fastening thereof on firearms including rifles, shotguns, pumpguns and automatic weapons having at least one barrel and stock longitudinally spaced from each other as joined to an intermediate firing mechanism. A scope is held by front and rear scope-support loop pieces secured on the unitary metal base in axially and longitudinally aligned loop portions thereof spaced parallel above the base. A flattened, reduced-size end is integral with the base and is recessed to receive in combination therewith a front sight member including a longitudinal rib and aiming projection, an elevated and enlarged end integrally joined to the base at a location axially and longitudinally remote from the reduced-size end.