How is the Sandman K? I am stuck between this and the Wolf-9SD, The K configuration seems interesting to me as it does not take much away from the length but provides some protection when shooting indoors. Have you found the Sandman K to be hearing safe on the Rattler?
Not quite the same as the Rattlers y'all have but I have been running a 6.75" 300 BLK MCX SBR with a Sandman K tucked under a 10" MI Rail for a while as a little backseat PDW. Subsonics are noticeably louder than a Omega 30, Hybrid, or Rugged Surge on an 8.5" DI gun or my Leonidas Integral upper. Supersonics are about as loud as a 10.3 5.56 with an RC2 and while I use a 110 gr Barnes going as fast as I can push it as my PDW load there is noticeable ringing after cracking off a few without ear pro but the edge is completely gone and it wouldn't be distracting.