Surefire M500A with White Nav lights, new in the box for Carbine length handguards - $400 Shipped.http://www.surefire.com/surefire/content/m500ad_full.jpg
The Millennium M500A WeaponLight replaces the weapon's original handguards and features built-in switching without any exposed wiring. Because of its lightweight and integrated design, this model is most recommended for urban law enforcement applications and civilian home defense. Each unit is equipped with four separate switches: (1) A pressure sensitive momentary activation pad (2) a constant-on switch (3) a system disable switch to lock the light in the OFF position for covert operations or to eliminate accidental light activation during storage, and (4) a second, smaller momentary switch to control two low-output LEDs that are useful whenever there is a need for a very small amount of light (stealth navigation, nighttime breaching operations, etc.)
The M500A is powered by three lithium batteries and produces 125 lumens for one hour of runtime with the high-output lamp, or 225 lumens for 20 minutes with the included ultra-high output lamp. A 1.625" diameter bezel provides the optimum beam spread for close to medium range engagements. Like all SureFire WeaponLights, the M500A is designed for peak performance in the harshest environments. Constructed from impact-resistant Nitrolon® polymer and featuring a shock-isolated bezel and lamp assemblies, this light features the highest degree of shock-isolation available to ensure reliable function in high-risk situations.