I just built a gun with one. I tell you what, I mounted it backwards! Personally I like it better this way and think thats the way it should have been made. It shortens the sight radius slightly, but the way the gun is built, sight radius is way longer than a carbine or midlength. Had I mounted it the way I believe it was intended to mount (where the sight fold forward instead of back) the front would have been hanging off the front of the rail and been easy to snag. If I mounted it far enough back so it would not hang off the rail, the sight radius would be even shorter than it is now that I have it set up backwards.
Its sort of big when compared to all the other rail mounted flip up front sights I have or have seen. This would include the KAC, Troy, and either of the YHM sights. Sorry I dont have pictures to post right now, but I will put some up tomorrow. The gun is a mid length Armalite carbine with a DD 12" rail, ARMS #40L, TA01nsn, Surefire M600 and Magpul XT pannels.