The SIG Sauer SRD piston conversion (brand part number SRDPISTONM16X1LH) lets SRD45 suppressor owners re-thread their host to a 16×1 left-hand thread pitch, opening up compatibility with a wider range of .45 ACP hosts. Machined from 17-4 heat-treated stainless steel and finished with a matte glass bead surface, the piston simply swaps in for the original piston already installed in the suppressor. It’s a straightforward way to match the SRD45 to a barrel’s thread pattern without sending the suppressor back to the factory or buying a second unit.

Key Specifications

• Converts the SIG SRD45 suppressor to a different host thread pattern.
• Threads to M16x1 left-hand pitch.
• Machined from 17-4 heat-treated stainless steel for durability.
• Finished with a matte glass bead surface.
• Installs by swapping out the original piston already in the suppressor.

Frequently Asked Questions

What does this piston do? It converts a SIG SRD45 suppressor’s host thread pattern to M16x1 left-hand, matching a wider range of .45 ACP barrels.

Is this piston itself an NFA item? No, this is an unregulated conversion piston; it does not include or replace the suppressor itself.

How is it installed? It swaps in for the original piston already installed in the SRD45 suppressor.

Buy the SIG Sauer SRD Piston Conversion, .45 ACP, M16x1 LH, Stainless Steel

Matching a suppressor’s thread pattern to a new host is far cheaper than buying a second can, and this SIG Sauer piston makes the swap simple. Browse the rest of our Class 3 parts and accessories and order from our Lubbock, Texas gun shop for fast, insured shipping.