I recently ordered the thread adapter for my .22 HW97K from AOA (but I had to call because it wasn't on their site yet), and am using a Tanto from DonnyFL. Both companies provided me with excellent service. AOA has never failed to impress me and my first transaction with DonnyFL was flawless. I can't provide a db reading, but the pop from the muzzle end IS lessened, to a degree, with no change from the piston end of course. It's not an overly loud gun to begin with, but I have a "sensitive" neighbor so I did what was feasible to me. One can't say I didn't try. There is also room for experimentation as the factory "muzzle chamber" on my gun was completely empty, so one could theoretically fabricate an insert for that as well. I am satisfied overall, and having the adapter gives me options.