Tom, Kevin will have to fill ya in on his can as I can't remember the make and model. Mine is the S.A.S. 5.56 Ti threaded model. I'm very happy with it, as most guys are when they get a can, and wish I'd have gotten one long ago. Even if it doesn't help put more fur in the truck, which I beleive it does, my hearing appreciates it very much.
Mine is even more effective when I screw it on a bolt rifle. Shooting prairie dogs is even more fun without big bang after big bang..