The Sig Sauer SRD Conversion Piston (Sig Sauer part no. SRD-PISTON-12X28) lets you convert an SRD9 or SRD45 suppressor to a 1/2×28 right-hand thread pitch, most commonly used to adapt an SRD45 down to run on a 9mm host. Machined from 17-4 heat-treated stainless steel with a matte glass-bead finish, the piston is built to hold up to repeated swapping and cleaning. Installation is simple: swap the conversion piston in place of the suppressor’s original piston to match whatever barrel thread pattern you are running.

Key Specifications

• Converts compatible SRD9 or SRD45 suppressors to a 1/2×28 right-hand thread.
• Machined from 17-4 heat-treated stainless steel.
• Finished with a matte glass-bead surface.
• Sized for 9mm hosts.
• Simple field-swappable design lets you change host calibers without sending the suppressor out.
• 17-4 stainless construction resists corrosion from repeated firing and cleaning.
• Matte glass-bead finish matches the suppressor’s factory finish.
• Compatible with a range of SRD9/SRD45 host configurations.
• A genuine Sig Sauer part, ensuring correct fit and headspacing.

Frequently Asked Questions

What suppressors does this piston fit? Compatible Sig Sauer SRD9 or SRD45 suppressors.

How do I install it? Simply swap the conversion piston in place of the suppressor’s original piston.

Buy the Sig Sauer SRD Suppressor Conversion Piston

Re-thread your compatible SRD suppressor to 1/2×28 and match it to a new host barrel. See more from Sig Sauer or shop our full lineup of Class 3 parts and accessories. Order it from our Lubbock, Texas gun shop for fast, insured shipping.