Increase your confidence with the Crimson Trace CMR-301 Railmaster Pro for rifles and long guns. The adjustable 1000 lumen LED light and green laser have a runtime of 1 hour on a rechargeable battery. Control the three modes including laser, light, and laser & light via the remote Instant Activation pressure pad or the tail-cap. The CMR-301 fits M-LOK, M1913 Picatinny or similar rails that are at least 2 3/4" in length.