A member of sig from SHOT Show explained on youtube that the 9" muzzle break is meant to have a suppressor put over it. Muzzle break + easy add suppressor? Yes please.
I may have to give this a closer look then. If the extra tube (that makes it a suppressor) is reasonably priced ($200-300), then this might be a nifty little thing. I'd prefer a .45ACP model, but so be it.