The Sidewinder piston 40sw 9/16x24. Engineered for consistent performance, this piston notably enhances your firearm's functionality. It's crafted using high-grade materials that ensure durability and longevity, making it an essential upgrade for enthusiasts. Enhance your shooting accuracy with this simple but profound enhancement. A recent customer shared how swapping to a Sidewinder piston dramatically improved the stability and precision of their shots during practice sessions. Perfect for those who value craftsmanship and performance, make this piston a key part of your shooting experience.