OK, so I got to looking at all of the pieces/parts and thinking about putting this thing together. A man's got to know his limitations, and all the fine work required is just not what I'm good at. I build refineries, pipelines, and big pieces of hardware.
So I talked with a local dealer and got a pretty decent deal on the RRA that I looked at before. I realize I paid more than I could have, but I saved myself a whole lot of angst. I can learn it over time, but I don't see myself ever being a real proficient armorer.
Anyway, so now I'm thinking about optics. I'm pretty sure that I want to go with the Aimpoint Comp M3.
If I do go with that sight, I'll need to get the right mount. My new AR has the RRA 'Dominator 2' mount:
It's height allows for an Eotech sight to be lined up so that the dot is just above the front post. So, the question is which mount for the Aimpoint? I want to put the Aimpoint at a height that will allow me to co-witness the iron sights. Of course, there are many options out there, but here are three that are made by Aimpoint on this page:
So we have optical center above the rail heights of 21.5mm, 26.1mm, 30.4mm (QR), and 38.9mm (QR with spacer) with these mounts. Do any of you know the optical center height from the rail for an Eotech? Interesting enough, I was unable to find it on the Eotech site in the specs, which surprised me, since it would seem that this would be important information to list.