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Suppressing short 5.56 firearms isn't trivial. The heat and pressure is serious. My 5.56 is 14.5" but the 300BO is the short one. Very different physics involved. Here's a very solid work on what happens with short 5.56. Worth consideration. I'd get a 300BO top for short suppressed work. One opinion...
Barrel Length Studies in 5.56mm NATO Weapons – Small Arms Defense Journal
www.sadefensejournal.com