I see. I guess I'd have to see what people have tried... port etc...
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I emailed BCM a week or so about this because it did not sound right to me. It is a carbine length gas system and a midlength rail.
12.5" Middy should work fine with a suppressor permanently attached. 11.5" the gas port is really close to the muzzle... that one I'd have doubts about.