One of the range safety officers at the KRRC in WA lets anyone use his 223 silencer. I hear that most people enjoy trying it out on their AR or bolt gun, but a few refuse. He is trying to get 10k rounds through it before he replaces it with a better built model. He plans on cutting it in half to see the effects on the aluminum baffles. If he made it right the first time he might not do that.