My offer stands, just PM me.
If your Colt is the Mil standard (small front pivot pin) then you'll be fine. The uppers are like the lowers. You can get the standard (+- $100) or match grade and CNC machined (180+) I don't think for a Aimpoint you would need anything but the standard, but it's up to you. There may be a color match problem if you mail order, but if should be close. As for the rear sight. The flat top upper has not rear sight, you have to add one to the rail. There is a height difference, but it's workable.It's Colt parts on a PWA receiver. Is there any particular thing I should look for in the upper or are they pretty standard commodities? Will the rear sight assembly just plug right in to the new upper? There's no height difference?
I do appreciate the advice, thanks!