AIM have released a Black and DE version of the T2 Red Dot sight. It's made out of metal and incredibly sturdy. It comes with 2 caps on the lens which prevent dust from getting in when it's not in use.
This version sits close to the rail and has an intensity of 5 for the Red dot can be adjusted easily for windage and elevation.
Powered by a single CR1632 3v Lithium Cell battery (included).