I don't put a lot of faith in testing, especially from the "factory". Humans can discern about a three db change. Most quality suppressors are fairly close in performance db wise and fall in or close to that. IMO, unless you can test at the same time, temp, humidity, ammo, etc, etc, you will get enough differences that invalidates any "absolute" numbers. Much rather have real world feedback, even if it is subjective. There are other "factors" such as frequency that play into the overall perception of sound reduction.