Please don't take this the wrong way Jerry, but even though it's a short barrel .223, it's still a rifle. There is very little recoil to a .223 even with max loads. So why magna port it (man....that's gonna be really loud) or put a muzzle brake on it?
My shootin buddy has a Bullberry 16" .223 and whacks the 400 yard 12" plate all day with no problems...no muzzle brake and no magnaport....and he can still hear!!!!
The .223 is loud enough on it's own. A muzzle brake or magnaport just makes it that much louder.
Just my $.02
Dave