[glockman19]

What one would be best suited for co-witnessing with a Stag model 2H pre-ban, 16" chrome lined barrel, ARMS #40 rear sight, A2 Front post?

http://www.stagarms.com/cart/images/rh2.gif

[Nomad, 2nd]

For Co-witnessing I'd go with the aimpoint...

[RobZ71LM7]

Pick whichever you like best. Both will easily lower 1/3 cowitness with the right mount. Now the EoTech however can do a true cowitness without an aftermarket mount. I've had both and I just barely like the EoTech better, but it's beating a dead horse.

[LiquidTension]

My EOTech cowitnesses fine, though I don't have a rear sight installed at the moment. I went with the EOTech because I wanted a 1MOA dot instead of 4.

[Trojan6]

Trijicon Reflex or Meprolight Reflex. No batteries to worry about and I like the triangle reticle. I know the new ones are good for 1,000,000 hours or something, but I'd prefer one less thing to go wrong. My .02 :)