This thread is about ACR barrels. Not AR barrels.
i think they are the same thing?
have a look:
https://shopquestar.com/shopping65/shopexd.asp?id=1848&bc=no
This thread is about ACR barrels. Not AR barrels.
The gas port hole is also smaller on an acr barrel... but good luck with your build.
+1. Where'd you source a 6.8SPC bolt from?
Did you put in the gas tube yet?
The ACR uses AR15 barrel extensions so it should fit on an AR15, as long as the gas tube is the correct length off the gas block. An AR15 barrel however wouldn't have the necessary cutouts to put the gas system parts on from the ACR.
Questar makes them for the AR but they say you can modify it for the ACR.