SIG SAUER SRD45 .45 ACP M16x1 LH Piston

The SIG SAUER SRD-PISTON-M16X1LH is a factory-pattern conversion piston for configuring a compatible SRD45 suppressor to work with a .45 Auto host barrel using metric M16×1 left-hand threads. It gives owners a purpose-built way to match the suppressor’s piston to this specific barrel thread pattern without replacing the complete suppressor mounting system.

Correct thread-pattern conversion

This piston is identified by manufacturer part number SRDPISTONM16X1LH and UPC 798681525157. Its defining specification is the M16×1 LH thread pattern. “LH” means left-hand thread, an important distinction when selecting a suppressor piston; a similar-looking piston with a different diameter, pitch, or thread direction is not interchangeable. Confirm the markings and thread specification on the intended barrel before installation.

17-4 stainless-steel construction

SIG SAUER manufactures this component from heat-treated 17-4 stainless steel. That material is commonly selected for hard-use suppressor components because it combines strength, corrosion resistance, and dimensional stability. A matte glass-bead finish gives the piston a low-glare, uniform surface while maintaining a clean factory-style appearance.

Designed for the SRD45 system

The piston is intended for a compatible SIG SAUER SRD45 suppressor. Installation consists of exchanging the installed conversion piston for the piston that matches the host barrel’s thread pattern. Because suppressor and host configurations vary, confirm SRD45 compatibility and the barrel manufacturer’s thread specification before use. This listing is for the conversion piston only; the suppressor, firearm, barrel, booster housing, and other accessories are not included.

Installation and care

• Verify that the firearm is unloaded and the suppressor is cool before handling or disassembly.
• Inspect the piston and host threads for fouling, damage, or cross-threading before assembly.
• Follow the suppressor manufacturer’s instructions for piston installation, lubrication, and maintenance.
• Check that the suppressor is properly seated and remains secure during use.

For owners who already use the SRD45 platform, the SRD-PISTON-M16X1LH provides a straightforward factory-spec solution for a .45 Auto host with M16×1 left-hand muzzle threads. Its exact thread designation, stainless-steel construction, and SIG SAUER system compatibility make it a practical spare or dedicated conversion component.

Key specifications

• Manufacturer: SIG SAUER
• Model: SRD piston
• Manufacturer part number: SRDPISTONM16X1LH
• UPC: 798681525157
• Caliber application: .45 Auto
• Thread pattern: M16×1 LH
• Material: Heat-treated 17-4 stainless steel
• Finish: Matte glass bead
• Compatibility: Compatible SIG SAUER SRD45 configurations