Remix of FTN.3 EZ Suppressor Pack v1.1 w/ 5-8"x24 threads, recommend getting cheap 5/8"-24 tap and to ensure threads are perfect. Use 5/8"24 to 1/2"x28 thread adapter. Print muzzle down, 3mm walls, 2mm top/bottom, 99%infill (lines). I can confirm this does work with .300BLK out of 16" barrel. Use the JB-Weld FIberweld wrap to add extra strenght.