Why does RRA not offer fluted barrel on Varmint upper?  

check out Kurts Kustom over under Industry Forums...he will mill your barrel to any configuration you want...and do an outstanding job..repark or moly coat it...or you can buy a fluted Wilson barrel directly from Wilson...If you want a lighter than standard RR configured rifle...check into the group purchase its not fluted but its lighter and the price is quite reasonable imo