CRUSHUNT 4x32 ACOG RifleScopes Red Crosshair Glass Etched Reticle Real Fiber Optics Sights Scope Magnification: 4x. Objective lens diameter: 32mm. Suitable for any 20mm RIS weaver standard rail. Full metal casting with rubberized matte black finish. Water Proof, Shock Proof, Fog Proof, and Weather Proofed. Illuminated aiming dot will be automatically adjusted the brightness based on available light.