I have finally come around to the Eotechs and I was going to mount it directly to my flattop and use the ARMS #40 BUIS.  

In this configuration, where does the front sight tower appear in the window of the Holosight.  Bottom third?  half way up?  I hope it doesn't obscure too much of the window

THanks

On mine, the front sight is about half way up. A better way to describe it is that the 1 moa dot sits right on or right above the tip of the front site post. I gather from most folks around here that it doesn't bother them. Bugged the heck out of me. I bought a PRI front folding sight and never looked back. With my Aimpoint, the dot is above the front sight. It still bothers me, but not bad enough that I switched to folding front sight.
Thanks.....Chad

The EO when mounted properly to the upper reciever rails will put it in the same plane as the rear site to front. ie. you'll be looking directly through the window at the front sight post in the center.  This may be a little high or low but not noticeably so.

When using the EOTECH for CQB (or any scenario really) simply change your cheekweld aim to hold over the dot(front sight post)by looking slightly above your rear sight (if up) and you'll be clear.  But this is not neccesary if you focus on your target.

Once you get used to the reticle you won't really even notice the sight tower.  Focus on your target and the reticle will follow on.

Especially with the EO I have found that the outer ring helps guide your point of aim to the dot.

For visual reference...
[img]http://photos.ar15.com/ImageGallery/Attachments/DownloadAttach.asp?iImageUnq=12631[/img]

Thanks guys