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I just wanted to add that the 300 blackout was also tailored to shorter barrels. If the goal is to keep it on a regular rifle lower then continue, however if you have a pistol or sbr lower, you could save a substantial amount of weight with an 8-10 inch barrel. 300 blackout really doesn’t start losing much velocity until around the 9inch mark or so. If you want strictly subs I would stick with a 8 inch, for a combination of subs and supers a 10 inch would work great.