I would agree with Rob or Iraqgunz.
Ditch the upper first.
If that's not an option, ditch the rail and front sight he has now and go with a good rail that will fit over the gas block and either an LMT fixed rail mount front sight or a Troy folding rail mount front sight. I prefer fixed sights, and would personally go that direction.
Last option would be to send it to ADCO to have the gas block replaced with a standard F marked FSB. This service is listed on their website for $90. Of course their will be shipping either way, etc.
I have used ADCO a couple of times in the past and always had excellent service, a good price, and very quick turn around.
-RD62


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