The Yankee Hill Machine Sidewinder Piston in .45 ACP with a .578×28 thread (brand part no. YHM-3225-28) is a booster piston for the Sidewinder suppressor platform, built for .45 ACP pistol hosts threaded to the .578×28 pattern. It lets the barrel move independently of the suppressor’s added mass, which is what keeps a recoil-operated .45-caliber pistol cycling reliably with a can attached. As a wear item, it can be replaced on its own as internal springs and seals age. It ships as a standalone service part, separate from the suppressor tube.

Key Specifications

• Chambered for .45 ACP, matching the pressure and bore diameter of that pistol cartridge.
• Threaded to .578×28, a common .45-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 thread pattern does this piston use? It’s threaded .578×28.

What caliber is it built for? It’s chambered for .45 ACP.

What does a Sidewinder piston do? It lets the barrel reciprocate independently of the suppressor’s mass, keeping a recoil-operated pistol cycling reliably.

Buy the Yankee Hill Machine Sidewinder Piston, .45 ACP .578×28

Order the Sidewinder Piston, .45 ACP .578×28 from our Lubbock, Texas gun shop for fast, direct shipping. See more pistol suppressor parts in our Class 3 parts and accessories category.