Sig Sauer M16X1LH Suppressor Piston - Convert your SRD45 or MODX-45 suppressor to a 16x1 left-Hand thread pitch with the SRD-PISTON-M16X1LH. The piston is made of 17-4 heat-treated stainless steel, with a matte glass bead finish, and it will fit a variety of hosts. Simply swap the conversion piston with the original piston in your suppressor to match your barrel thread pattern. Threads: M16 x 1 mm Material: Stainless Steel