Seriously, just don't. You've already got a rugged, dependable, front sight and gas block. Put the RDS or whatever on and run it. You'll find you don't even notice the front sight in there.
If, after shooting it a while you decide you absolutely can't live with it, I usually build with the PRI flip up. I don't think that will be the case though. :D
...the secret is to bang the rocks together, guys.
That which does not kill you has made a tactical error. --Tayler