Finally got some EOTech 553 sights in. The first things I noticed was the silver colored stainless steel windage and elevation screws and the two small throw-levers on the integral ARMS mount. The sight is made to be instantly attached to a 1913 picatinny rail. It can be removed and reinstalled with no more than a one minute loss of zero. The recoil lug under the sight is true 1913, and will not fit on Weaver style bases with the standard recoil slot of about .146. The recoil lug is about .196 and will simply not fit. The side-to-side differences also preclude a proper fit on Weaver style bases. There have already been fit problems with some Rock River Arms flattop receivers, probably tolerance issues with the manufactured size of the rail.
The new 553 uses CR123 batteries, and runs up to 1100 hours on a pair of them. The battery compartment is secured to the sight to prevent loss or a drop. The base is about 7mm higher because of the ARMS mount, and I prefer the slightly higher dot position over the front sight post. It allows for even more peripheral vision, which is why the EOTech sights are my favorite top quality sights in the first place in a non magnified optical device. Be sure to read much more complete information on our website.

A customer asked the other day if he should lap his rings, and how to go about it.
It's a no brainer. The first use you get out of your lapping tool or one inch bar is when your bottom ring halves are mounted on your gun and you drop the tool in. It should drop to the bottom of both rings. If it doesn't, you can move your rings accordingly, most often your rear windage screws on a Leupold type base. The front ring might require a degree or so of a turn also. It's really easily seen with your naked eye. Don't use a wrench with a towel around it. Sooner or later you will bugger a ring and it will piss you off every time you look at it. Buy a scope tool for a few bucks. They are worth their weight in gold and will last forever. Put a TINY bit of Flitz, or rouge, or lapping compound on your lapping tool, taking care NOT TO GET ANY ON ANYTHING ELSE! Remember, it's an abrasive. I cover my action with a paper towel, not cloth so I'm not tempted to reuse it. Install the top half of your rings. Not so tight that you can't move your tool back and forth, because that's what you're going to do next. Rub the tool back and forth with firm pressure up, down, sideways. Don't do it too fast to cause a lot of heat. You are simply wearing down high spots. It doesn't take a lot. Of course, if your rings have not been aligned properly in the first place you are wasting your time. CLEAN EVERYTHING LIKE YOUR LIFE DEPENDED ON IT. Including your tools. When clean, your rings will have shiny spots that were burnished down by your work. This gives your rings better contact to your scope with less chance of scratching your tube or even denting it. Most rings will benefit from this procedure, and I do it every time I install a new set.