The Yankee Hill Machine Sidewinder Piston in .45 ACP with a 16×1 left-hand thread (brand part no. YHM-3225-ML) is a booster piston for the Sidewinder suppressor platform, built for .45 ACP pistol hosts threaded to the 16x1LH metric pattern. It lets the barrel move independently of the suppressor’s added mass, which 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 16×1 left-hand, a metric .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 16×1 left-hand.

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

Is this different from the .578×28 Sidewinder piston? Yes, this version is cut for the 16x1LH metric thread pattern rather than .578×28.

Buy the Yankee Hill Machine Sidewinder Piston, .45 ACP 16x1LH

Order the Sidewinder Piston, .45 ACP 16x1LH from our Lubbock, Texas gun shop for fast, direct shipping. Browse more pistol suppressor parts in our Class 3 parts and accessories category.