The only way to add a suppressor to your PS90 is to replace the shroud with one that has a threaded muzzle. Huntertown Arms and Imperial Arms are the only ones who make these shrouds currently. HTA is out of business. To use this shroud you are required to remove the blind pin from your current setup, and carefully unthread the factory shroud to ensure the barrel threads stay intact. The main shroud is aluminum, and the threaded insert (slip fit) is steel. This HTA shroud will not allow for the barrel to move as the factory does. I had no issues when I originally reviewed the shroud.
I am asking $125 shipped for the shroud. I have a spare 16" barrel that was used with the shroud that has clean threads and very little rounds down range. If you are not able to remove your barrel without damaging the threads, I will gladly trade you this 16" barrel for your 16" take off. Otherwise I will sell you this barrel for $225. I can accept PayPal, Venmo, CashApp.
IMG_1356 by
Buffman RANGE, on Flickr
IMG_1357 by
Buffman RANGE, on Flickr