Remix of FTN 4 CHODE series with a 5/8"x24 thread pattern, I recommend getting a cheap 5/8"x25 tap and run thru after printing to ensure the threads are as clean as can be, use 1/2"x28 thread adapter for barrel. Print muzzle down, 3mm walls, 99% infill (lines), 2mm top/bottom.
RFHP9 v1 (RGB Crescent Remix) (UNTESTED)
ChurchMouse 22lr Suppressor_5_8-24
Ven22ri 5-8x24