I personally own an Evo .40 can. Which is the user serviceable version of this can. And also in .40 and it's super quiet on my .40, 9, or even .300blk subs.
I found the correct thread adapter to put it on a 300blk. And the site says its okay. It just says make sure you change out the piston system with the fixed barrel spacer
I'm not sure if this has been asked or not, but I have heard that a .40 or 9mm suppressor is totally compatible to shoot 300blk through as long as its subsonic? What's everyone's opinions? I have an AAC Evo .40. Don't want to rip the insides out of this thing.