Sig Sauer SRD Piston .578" x 28 45 ACP 17-4 Stainless Steel Black

The Sig Sauer SRD Piston in .578" x 28 thread pitch is a conversion component engineered to adapt your SRD45 suppressor to different host firearms. If you've already invested in an SRD45 suppressor but need it to work with a .578" x 28 threaded barrel—common on many 45 ACP platforms—this piston swap lets you do exactly that without replacing the entire can. It's a practical, cost-effective way to extend your suppressor's compatibility across multiple guns in your safe.

Built from 17-4 heat-treated stainless steel, this piston is engineered for durability and reliability under the pressures of centerfire shooting. The matte glass bead finish resists corrosion and gives it a professional, no-nonsense appearance. Installation is straightforward: remove your current piston from the SRD45 and swap in the .578" x 28 version. No gunsmithing, no special tools—just a simple parts swap that takes minutes.

Whether you're running a Sig Sauer 1911, a custom 45 ACP build, or another firearm with a .578" x 28 threaded muzzle, this piston opens up your suppressor to a wider roster of shooting platforms. It's the kind of accessory that pays dividends if you shoot multiple calibers or hosts and want your suppressors to work as hard as you do.

Key Features

• Converts SRD45 suppressor to .578" x 28 thread pitch compatibility
• 17-4 heat-treated stainless steel construction for durability and corrosion resistance
• Matte glass bead finish for a rugged, professional appearance
• Simple swap-in installation—no permanent modifications to your suppressor
• Expands host firearm compatibility for multi-gun shooters

Specifications

Frequently Asked Questions

Will this piston work with my SRD45 suppressor?

Yes. The SRD Piston .578" x 28 is designed as a direct replacement component for the SRD45 suppressor. Simply remove the original piston and install this one in its place.

What firearms have a .578" x 28 thread pitch?

The .578" x 28 thread pitch is common on many 45 ACP platforms, including certain Sig Sauer 1911 models and other 45 ACP firearms. Check your barrel's thread pattern before ordering to confirm compatibility.

Do I need any tools to install this piston?

Installation is a simple piston swap. The original piston is removed and replaced with this one. No permanent modifications to your suppressor are required, and the process can be completed with basic handling.

What's the material and finish?

This piston is made from 17-4 heat-treated stainless steel with a matte glass bead finish, offering durability and corrosion resistance for reliable long-term use.