The Rail-LockA(R) 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.