I took a piece of the foam from an empty can of JSB Pellets, cut a strip about 1/2” or 3/4” wide and maybe 2” long or thereabouts. Just long enough to wrap the barrel. This foam inside the shroud slows the air down that is escaping the shroud vent in the threaded fixture. This has given my Kratos a deeper tone and reduced noise noticeably. Well worth the effort. Give it a try guys and see how it works for you! I’m super happy with it.
quick question...when you unscrew the shroud....are you twisting counter-clockwise against the plug that is held to the barrel with those two grub screws. I don't want to start cranking on things until I know what to expect.