Ebola, if you look at the sight, you will see the actual sight goes another half to three-quarter inch forward from after those little side rails. If you look closely at Rallyguys' picture you may see more clearly that there is a sun shade that scres on the front and also has the lens cap. The sunshade goes back from the lens cap maybe an inch and a half. It really does make the whole thing appear a bit longer than it is.
I would love to get hold of the AR536 too.