I think its funny people arguing with the suppressor manufacturer, because they know more than Zak, lol. I have a couple cans and the 308 subsonic out of a bolt gun is almost movie quiet (Zak's can) but what really surprised me is that it doesn't matter if the bullet is 1fps supersonic or 2000fps over its too loud without plugs. The AR you can shoot a couple without plugs but the ears start ringing pretty quick. The 22 is really the only one that doesn't seem to ever make my ears ring.