The Rail-Lock® version of our top-selling Surefire X300U Ultra-High-Output Led Handgun Light is a trusted choice for law enforcement and military personnel worldwide. This version now boasts an impressive 1,000 lumens of LED output, focused by a precise TIR lens to create a high-intensity beam with a broad center spot that is highly effective for close- to medium-range engagements. The X300U is capable of positively identifying threats at significant distances while temporarily impairing the adversary's vision. It also provides ample peripheral illumination for situational awareness. Ambidextrous switching allows for one-finger control of momentary-on or constant-on activation. Its durable, aerospace aluminum body is Mil-Spec hard anodized for scratch and corrosion resistance and sealed for weatherproofing. It is also IPX7 waterproof up to 1 meter for 30 minutes. You can trust the X300U to deliver a standard of excellence.