All my Ar's have fixed carry handles so I have decided to buy a flattop.  I would like to purchase the C-MORE tactial sight, here is my question:  Will the rear peep sight on the C-MORE obstruct the view of the red dot sight picture?

Don't know specifically about the C-More but the Eotech which is similar will co-witness with the iron sights if mounted on an extension in front of the carry handle.  I am going to buy the Eotech with the metal protective frame for around $284 (less for one model lower.)  There's a good thread on this under sights.

I know this is does not reference your flattop question exactly but might be something you had not considered.

Here is a place that sells Eotech and advertises on this site.   [url]www.swfa.com/riflescopes/eotech/[/url]