Questar makes them for the AR but they say you can modify it for the ACR.
Well, best of luck. Let us know how you make out...
"Before me things create were none, save things Eternal,
and eternal I endure. All hope abandon ye who enter here." Tune in next week... Same Bat time, same Bat channel.
got my 6.8 upper put together. head spaced and ready to go. yes its the ACR barrel! i used the mid length gas system with adjustable gas block because i'm not sure what the 6.8 gas is like?
once i get to the range i can update on how it shoots.