Asking about a "most accurate barrel" and then restricting it to a .300 blackout and then saying you shoot "long range" is like saying you want a great 4x4 SUV that you can drag race, but will only drive on the interstate.
.300BO is not exactly the most inherently accurate AR based round there is and should be anyone's last choice if they are even remotely interested in "long range", let alone "accuracy".
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