So I got one, RMR 06, i.e. 3.5 MOA dot, adjustable brightness.
Was impressed when first taking out of the box because it's very solid, wasn't so impressed when putting it together. First thing that narked me off was that you need three different hex wrench sizes to screw it all together, one for the mount, one for the grub screws and another to screw the sight onto the mount.
Then it didn't work, because they've forgotten the first rule of electronics engineering - batteries vary in size, so you use springs to hold them in. The supplied CR 2032 was a bit too thin to apply enough pressure to the contact to work. So I phoned them and they told me to thicken the battery with electrical tape - not very reassuring given the price. But it did work (and it was several layers of tape too). My personal view is that the mount should have a flat spring on it to push the battery upwards. (I note in the SHOT show thread they didn't have the RMR on the ACOG).
The grub screws at the front of the mount are superfluous, I could see why you might need them if your ACOG is a mess but all they did for me was make zeroing impossible (by applying pressure to the front of the mount) so I removed them.
However after all that it does work, and it's better than the dot sight I had from JP Enterprises. The best part of it is the windage and elevation adjustments are bang on and I was able to "do a square" and the adjustments remained correct. Also having the brightness adjustment is really helpful, no question.
I'm just concerned about the longevity of the battery compartment contact, but it is a .223 rifle so it doesn't get jolted around like it would on a pistol. Plus it's not like I'm using it on a machinegun or anything.
