Well, if we are speaking the same language. You can have this:
Amazon.com: Removable Carry Handle, Black, AR15/M16: Sports &
This handle will mount to an A4 flat top that looks like this:
Daniel Defense Upper Receiver Stripped AR-15 A4 Flattop Matte - MidwayUSA
Then you can get a scope mount like this:
AR Rifle Accessories, A3 A4 AR-15 Mounts, Armalite, Picatinny Weaver Scope Mounts, Weaver Scope Rings, Burris Scope Rings, Warne Scope Rings, Leupold Scope Rings, Harris Bipods
For the right size scope you want to use.
When you want your scope, you run with that, when you want your carry handle and your iron sights, you unscrew the scope mounts and attach the carry handle.
Now, if you want to get fancy, you can go with something like this:
LaRue Tactical 30mm 2 Piece QD LT-123
These are quick release type mounts.
Or, you can just get a flat top receiver, get the scope you want and get a set of back up iron sights that fold down and out of the way. Which is what most of us do.