SureFire Dedicated Shotgun Forend (DSF) Series LED WeaponLight Virtually indestructible, two-output LED generates 600 lumens of blinding light on its max setting, and 200 lumens with nearly twice the runtime on high Surefire Shotgun. Mossberg 500 and 590 shotguns with either 6 inch or 7  inch forend tube. Bezel Diameter - 1.37 inches Switching: ambidextrous momentary- and constant-on switches on both sides, output-mode-selector switch on left side, system-disable switch on forend bottom Slender, lightweight, high-impact polymer forend is textured for secure grip Construction: Mil-Spec hard-anodized aluminum body; coated, tempted window; O-ring & gasket seals for weatherproofing Virtually indestructible ultra-high-output LED generates 600 lumens of blinding light on its max setting and 200 lumens on its high setting Precision reflector shapes a versatile beam with reach and plenty of surround light for close-quarter applications and beyond Ergonomic switching: output-mode-selector switch, momentary- and constant-on switches on both sides, system-disable switch on bottom Slender, high-impact polymer forend is textured for secure hold Mil-Spec hard-anodized aluminum body, tempered window & O-ring seals make Weapon Light rugged, durable and weatherproof