Can you use iron sights with the OKO?  I want to find a red dot that I can put on an Ultimak and still co-witness with irons.  I know Aimpoint will work, but I think the OKO might fit into the budget a little better.

Also can anybody comment on the pressure switch that it comes with?  Is it a momentary type switch, or can you turn it on and leave it on, then hit the switch again and turn it off?

Does the switch help or is it overkill.  I plan on using a surefire w/ a tape switch and I think it may get confusing with all those switches.

thanks for your input