Silencertests.com can be helpful in making a decision, but understand they are biased towards AAC products. And while the charts are helpful, the dB reduction number does not always tell the full story of whether a particular suppressor sounds more quiet to the human ear than another. And finally, there are other factors that should be considered in making a decision on a can that aren't based upon testing or numbers such as a company's reputation for customer service. Don't get me wrong Silencertests is a helpful site and I've owned AAC cans, but places like the NFA discussion boards at AR15.com and Subguns.com can also be very helpful in making a decision also.