Quick view Sig Sauer Sig Sauer Srd Piston, Sig Srd-piston-m16x1lh Piston 45auto M16x1lh $133.59 Convert your srd45 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... Compare Add to Cart