The .300BLK was originally designed to be subsonic using 200gr-plus bullets fired out of a suppressed barrel. This is an optimal length for that load. You will lose quite a bit with supersonic ammunition (which should not use the suppressor).
This is a dedicated short-barrelled rifle build which the owner is going to use primarily suppressed with subsonics. Pistol gas system.
We build 16" uppers with carbine gas systems for hunters using this caliber.
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