The SureFire 318LM replaces the original forend of your Remington 870 shotgun. Extremely compact 3-volt (1-battery) system features a virtually indestructible LED emitter focused by a TIR lens, which produces a brilliant beam optimized for close- to medium range applications. Two switches are integrated into the forend: a momentary-on pressure pad switch (right side) and a constant-on rocker switch (left side). The 318LM generates 100 lumens of output and has a tactical runtime of 1.4 hours per battery, with gradually decreasing output afterward. The tough polymer body features a molded-in high-friction pad for enhanced grip in wet or cold conditions. Fits: Remington 870 shotgun Features Virtually indestructible LED and TIR lens produce brilliant beam optimized for close- to medium range applications Switches—Momentary-on pressure pad, constant-on rocker Construction—High-strength aerospace aluminum with Mil-Spec anodizing; impact-resistant polymer; coated, tempered window Weatherproof—O-ring and gasket sealed Includes high-energy 123A battery with 10-year shelf life Max Output -- White Light 100 .0 lumens Tactical Runtime* 1 .4 hours Bezel Diameter 1 .00 inches Weight w/Batteries 1 .1 pounds Batteries 1 123A (included) *Runtime (at highest setting for multiple-output flashlights) until output drops below 50 lumens