I installed this today on my ECHO 1 M16A4, and my god does it look sexy. The brightness is great for both red and green dots. Easily adjustable for windage and elevation. The flip up lens covers are nice, though they seem like they might crack from a direct hit with a high FPS weapon such as a sniper. The body I believe is full metal. Also, the reflective front lens looks intimidating (they can watch themselves get destroyed). Mounts solidly to stanard rails. All in all, a very good dot sight for the price.
Looks beastly on an M16
Red/Green (depends on your prefference i guess, I can't decide which I like more
Pretty much full metal (lens covers are plastic but sturdy and dont wobble around)
Amazing quality for the price
Comes w/ extra battery and cleaning cloth
Lens covers might crack from a solid hit with at high fps
Battery compartment is a bit difficult to close up again, but didn't take more than 20 seconds
These are minor cons, this sight is totally worth it!
Rating: [5 of 5 Stars!]