I am interested in converting the standard front sight on my Colt 6720 to a gas block which would accept a flip up sight in the front. I am not sure what to get or what is recommended for the lightweight profile barrel of the AR6720. I would essentially like to have a front sight I could use with my removable carry handle or switch out to a rear flip up sight if I plan to ever use a scope or holographic sight. Any help and recommendations would be appreciated. Thanks!