The CMR-201 Rail Master is a powerful and versatile Laser Sight designed to fit rail-equipped pistols, rifles and shotguns. The Rail Master locks onto Picatinny M1913 or Weaver-style accessory rails with Crimson Trace Secure Locking Technology. Once locked on, it will not budge under recoil or handling. Instant Activation technology allows you to simply inchtap on inch and inchtap off inch from either side with the ambidextrous activation control tabs. Additionally, the CMR-201 features a 5 minute auto-shut off feature that will power down the unit to conserve battery life if the laser is unintentionally activated. Powerful 5mW red laser Instant Activation: simply tap to turn it on and off Ambidextrous activation tabs Fits M1913 Picatinny or Weaver-style rails with a minimum of 1 1/16 inch from recoil lug 4 hours of constant run time on (1) 1/3N lithium battery 3 modes: momentary, strobe, and constant-on Secure Locking Technology keeps it firmly in place Includes (4) different inserts to fit various platforms Order today!