Trijicon have updated their mini red dot RMR sight. They claim the new model is tougher than any other mini red dot available.

When precision is the only option, your best option is the Trijicon RMR™ Sight. Built to provide optimum red-dot visibility against the target, you can acquire and hit your target quickly and more accurately.

The new Trijicon RMR™ (Ruggedized Miniature Reflex) has been introduced to match the legendary toughness of the Trijicon ACOG® (Advanced Combat Optical Gunsight).

It can be teamed up with the ACOG® or AccuPoint® for the ultimate in fast target acquisition or precise aiming at extended distances.

They start at $425.