The SIG Sauer SRD Piston, .45 ACP, .578×28 Right-Hand (SIG Sauer part no. SRD-PISTON-578X28) converts an SRD45 suppressor to the .578×28 right-hand thread pattern. It is made of 17-4 heat-treated stainless steel with a matte glass bead finish. Installation is a swap: the conversion piston replaces the original piston in the suppressor so it matches your barrel thread. Check your barrel thread first, since this piston is cut for .578×28 only.

Key Specifications

• The piston is made for the SIG Sauer SRD45 suppressor, the .45 ACP model it converts.
• The thread is .578×28, the pattern your barrel has to match for the suppressor to mount.
• The thread hand is right-hand, the direction your barrel threads must run.
• Material is 17-4 heat-treated stainless steel, a strong alloy that holds up under repeated firing.
• The finish is matte glass bead, a non-reflective surface that is easy to wipe clean.
• It installs as a direct swap for the original piston, with no other parts to change.

Frequently Asked Questions

What thread does this piston match? It matches .578×28 right-hand barrel threads.

Which suppressor is it for? It converts the SIG Sauer SRD45 suppressor, the .45 ACP model, to the .578×28 right-hand thread pattern.

How is it installed? Swap it for the original piston in your suppressor to match your barrel thread pattern.

Buy the SIG Sauer SRD Piston, .45 ACP, .578×28 Right-Hand

Pick this piston when your host barrel is threaded .578×28 right-hand. Browse more from SIG Sauer in our gun parts and accessories selection, shipped fast and direct from our Lubbock, Texas gun shop.