Holosun Technologies Rail Mounted Laser, Red Laser, Fits 1913 Picatinny Rail, Black RML-RD The Holosun Rail Mounted Laser (RML) is a single emitter pistol laser that features Excellent Zero Retention with tactile and audible windage & elevation adjustments and universal Picatinny Rail compatibility just like their Red Dots. The RML was designed for excellent Weapon Light Holster Compatibility and is available in Durable Polymer with the choice of IR" Red or Green laser emitter models. The Rail Mounted Laser's waterproof rating is IPX8. One 1/3N lithium battery is included.