So, I purchased this from ASGI for 15 dollars like it says. It came in a thick plastic bag with the JBU green tag sealing it all up. I consists of 3 parts: The sight, the bolt, and the nut. Everything is metal and it's a very nice rear sight. I am currently using it and it seems easier to see through because of the I want to say, wider, FOV. This sight also allows for a red dot to be added in front or behind. The windage is a little hard to adjust without a screw driver and there's no elevation. This is a must have for flip up front sights. I'm paying the price because I have to take my front iron sights on my M4 off whenever I want to use my red dot. It also flips down with ease too. Over all, this is a very nice sight.
-All metal construction
-Easy to put on
-Easy to use
-"wider" Field of view
-2 different apertures, just like the regular carry handle
-Allows for red dot sights too
-Hard to adjust windage
-I know this isn't really a con, but it sucks with non-flip up sights. Front flip up sights are a must with this.
Overall, this is a very nice sight.