Sig Sauer SRD Piston 9mm 1/2×28, 17-4 Stainless

This Sig Sauer conversion piston adapts SRD-series suppressors to a 1/2×28 right-hand thread pitch. Machined from 17-4 heat-treated stainless steel with a matte glass-bead finish, the piston is intended to be swapped into the suppressor in place of the original piston to match barrel thread patterns. It is designed to fit a variety of hosts for shooters seeking thread compatibility with common 9mm barrels.

Key Specifications

• The thread pitch is 1/2-28 (right-hand) for common 9mm muzzle threads.
• The piston is compatible with 9mm suppressor configurations.
• The piston material is 17-4 heat-treated stainless steel for strength and corrosion resistance.
• The finish is a matte glass-bead (silver) surface treatment.
• Intended for use with SRD9 and SRD45 Sig Sauer SRD suppressors according to the product description.
• Product type is listed as a Piston (suppressor conversion piston).
• The overall length is 4.00 inches.
• The listed dimensions are 1.15 x 1.15 x 4.00 inches.

This piston provides a straightforward, serviceable way to adapt SRD-series suppressors to common 1/2-28 threaded 9mm barrels. Its stainless construction and matte finish are suited to repeated installation and field use, offering a practical option for shooters who need reliable thread conversion without altering the suppressor body. Install by replacing the factory piston with this conversion piston to match your barrel thread pattern.