Looking for a 9mm/300BLK subsonic can and it has attracted my attention. Just curious if anybody has tried this combo, how quiet it is, and who in Indiana stocks Thompson Machine. I'm waiting to use it on a 8.5" upper. The HTA Guardian 9 isn't rated for 300BLK subsonic any more or that would be on the list, Liberty Mystic is a little out of my price range when you start adding the attachments, maybe Gemtech GM-9.