Silencerco 17-4 Stainless Steel Piston for .40 S&W Handguns, 9/16-24 - AC31
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Product Details
MSRP $94.99
MPN AC31
UPC 817272010213
Description
The SilencerCo AC31 Osprey/Octane Piston 9/16x24 40 S&W Stainless Steel is a versatile, easily changeable piston system designed for quick adaptation across different host firearms and calibers. Crafted from 17-4 stainless steel and heat-treated for maximum durability, these pistons integrate with SilencerCo threaded barrels via female threading, forming a reliable connection for semi-automatic cycling as part of the Nielsen device that unlocks pistol barrels. For fixed barrel applications, you can throw a Fixed Barrel Spacer, expanding the range of configurations without sacrificing performance. The models XL variants provide additional length between the threaded barrel and the silencer, accommodating longer, more stable alignment where needed. This piston set is purpose-built for the 40 S&W platform and features a robust stainless finish to withstand rigorous use and demanding shooting environments. Designed to be compatible with SilencerCos Osprey and Octane silencers, these pistons enable rapid caliber and host firearm changes while maintaining consistency in cycling reliability, muzzle behavior, and overall suppressed performance. Whether upgrading an existing system or tailoring a setup for specific hosts, this piston option delivers durable construction, precise threading, and flexible fitment.