www.awcsystech.com/A close friend of mine has been a class 3 dealer for the past 10+ years. He has seen/heard all kinds of cans and he has told me many many times awc is the quitest he has ever heard. Now I don't have any experince with a detachable can, but I did get one from him thats built into a ruger 77/22 ( basicly its a bolt action 10/22) No way to take the supressor appart, but it doesn't require the maintence other suppressors do. According to AWC every 1000 rounds I have to soak it in solvent. I was amazed how quite it was, honestly it doesn't even sound like a gun at all. The best way I can describe it is that it sounds like a twig snaping in half, and its about as loud!! Now keep in mind that this is a bolt action gun so I don't have the noise of an semi-automatic action slaping back and forth to deal with ethier.
AWC has a can for the 22 walther pistol one they have in titanium and they don't charge extra for it.
Edit: To make the link hot.