NOTE: This is the “A” version of the X300. But has been updated to 1000 lumens.

The Surefire X300U is one of the most widely-issued weapon lights in special operations and law enforcement units. And for good reason. It boasts an impressive track record, is nearly indestructible, and has improved with the times at a steady pace. The just-released (as of July 2018) X300U-A outputs 1000 lumens on two CR123A batteries for a tactical run time of 1.25 hours. The beam is tight with a focused center and spill on the edges. This means the light can be used at distance very nicely. We highly recommend the X300 series of lights at T.REX ARMS.

Activating the X300 Ultra is done via intuitive, ambidextrous switches—now wider and shorter for improved ergonomics—at the rear of the body. Simply press the switch on either side for momentary-on activation or flip up or down for constant-on activation.

The X300U-A attaches to pistols and rifles with the Surefire Rail-Lock system. On each side of the X300 is a plastic tab. Pull both plastic tabs downwards and slide the weapon light onto the rail. To remove, simply repeat. Its high-strength aerospace aluminum body—including the mounting system—is Mil-Spec hard anodized for superior toughness and it is O-ring sealed, making it weatherproof.

More info here.