Convert your SIG SAUER suppressor to a 1/2×28 Right-Hand thread pitch. Convert your MODX-9, MODX-45, SRD9, or SRD45 suppressor to a 1/2×28 Right-Hand thread pitch with the SRD-PISTON-12X28. The piston is made of 17-4 heat-treated stainless steel with a matte glass bead finish. The piston will fit a variety of hosts, and it is a perfect choice for converting your SRD45 to 9mm. Simply swap the conversion piston with the original piston in your suppressor to match your barrel thread pattern.