The Crimson Trace CMR-201 RailMaster is a powerful and versatile laser sight designed to fit rail-equipped pistols rifles and shotguns. Featuring 5mW red laser output and Secure-Lock Technology this universal laser sight locks securely onto Picatinny M1913 or Weaver-style accessory rails.Crimson Trace CMR-201 RailMaster Universal Red Laser Sight5mW red laser with over 4 hours of battery life on single 1/3N lithium batterySecure-Lock Technology prevents movement under recoil or handlingAmbidextrous Instant Activation controls with tap-on/tap-off operation5-minute auto-shut off feature to conserve battery lifeIncludes 4 different inserts for various firearm platformsFactory sighted at 50 feet with user-adjustable windage and elevationCompatible with M1913 Picatinny or Weaver-style accessory railsPerfect for tactical applications hunting and target shooting across multiple firearm platforms with reliable performance and universal compatibility.