Ok my NFA paperwork came back Monday and I picked up my Sparrow yesterday. I took it out behind the house and shot a couple of magazines with and without the suppressor It is a lot quieter with the can installed but its far from quiet. I would say that with the can installed my neighbor 1/4 mile away will still be able to hear it. I admit that I went through my 22LR stash and couldn't find any subsonic ammo, just high velocity stuff. I'm hoping that with the subsonic stuff it will get the the noise level down where I thought it would be or maybe I was expecting too much. I have watched some videos on Youtube and they seem quieter than mine. I even took it apart to make sure it was all there.