This light has a bit of paint off due to transportation, so we dropped the price. Only buy it if you can accept the imperfection. 

Compact and extremely powerful, the M620 Ultra Scout Light uses a virtually failure-proof LED to produce 500 lumens of output, and it continues producing blinding tactical light for 1.5 hours on a set of batteries. This brilliant output is focused by a Total Internal Reflection (TIR) lens into a far-reaching beam with an intense 13,000-candela central area that also provides significant peripheral illumination, making it ideal for close- to longer-range applications.

The compact size of the M620 Ultra under 5.5 inches long minimizes added weight, frees up rail space for other accessories, and increases weapon maneuverability compared to larger WeaponLights.

The M620 attaches to your firearm's Picatinny rail via an integral SureFire Swing-Lever clamp. The Swing-Lever clamp provides rapid, secure, rock-solid attachment even to out-of-spec rails by moving a single cammed lever, and it detaches just as quickly should the need arise.
The M620 Ultra comes with two switches: (1) a pushbutton tailcap switch: press for momentary on, press further to click constant-on; and (2) a momentary-on tape switch with a 7-inch cable that attaches to your preferred location via self-stick Velcro backing.