I just acquired a high quality Douglas 223 AR barrel and it has the standard, non M4, feed ramps. Rather than modifying the barrels feed ramps, I am looking for a flat top upper receiver with standard feed ramps. I found a couple of new upper options, but i thought I would check to see if anyone has a quality used one they are willing to sell. Thank you.

Freedom is never more than one generation away from extinction. We didn't pass it to our children in the bloodstream. It must be fought for, protected, and handed on for them to do the same. Ronald Reagan