Spot your target with the Crimson Trace CMR-201 Rail Master Universal Red Laser Sight. This powerful 5 megawatts red laser fits M1913 Picatinny and Weaver-style rails securely with immovable Secure-Lock Technology™ and 1 of the 4 included platform inserts. Tap the Instant Activation™ on or off for instant control, and adjust for wind and elevation for accuracy. It runs for over 4 hours on a single battery thanks to the 5-minute auto shutoff feature.