The Yankee Hill Machine Sidewinder Piston in .40 S&W with a 9/16×24 thread (brand part no. YHM-3235-24) is a booster piston built for the Sidewinder suppressor platform on .40-caliber pistol hosts, allowing the barrel to move independently of the suppressor’s mass for reliable semi-auto cycling. It’s threaded to 9/16×24, matching a common .40-caliber suppressor-ready barrel pattern, so it drops into a compatible host without additional fitting. As a wear item, the piston can be replaced on its own without buying a new suppressor. It ships as a standalone service part.

Key Specifications

• Chambered for .40 S&W, matching the pressure and bore diameter of that pistol cartridge.
• Threaded to 9/16×24, a common .40-caliber suppressor-ready barrel pattern.
• An overall length of 5.5 inches covers the full piston assembly.
• Built for the Sidewinder suppressor platform, allowing independent barrel movement for reliable cycling.

Frequently Asked Questions

What caliber is this piston built for? It’s chambered for .40 S&W.

What thread pattern does it use? It’s threaded to 9/16×24.

Why does a suppressed pistol need a piston? The piston lets the barrel reciprocate independently of the suppressor’s added mass, keeping a recoil-operated pistol cycling reliably.

Buy the Yankee Hill Machine Sidewinder Piston, .40 S&W 9/16×24

Order the Sidewinder Piston, .40 S&W 9/16×24 from our Lubbock, Texas gun shop for fast, direct shipping. Browse more Class 3 parts and accessories.