The world wouldn't mind a duty rated 10mm PCC, piston driven AR that could withstand a high volume round count of max power 220-230gr loads. Companies like KAC, Noveske, BCM, DD, LWRC, LMT, Barrett.
An FN SCAR in 10mmAuto would be superb!
It's a shame the FBI's HK mp5/10 were having durability issues with 10mm- cracking and such.