Are you surprised Ruger has gotten into the silencer business? While admitting they caught me by surprise when I was shown the new Silent-SR – silencer/silentsr, get it? – I should have seen it coming. After all, Ruger has been producing rifles and pistols with threaded barrels for several years, silencers are growing in popularity and there is a growing movement to take them off the federal registry that requires a $200 tax stamp.