PISTON M13.5X1LH Manufacturer Model Number: AC26 Manufacturer: SilencerCo Model: Adapter Caliber: 9mm Type: Accessory-Silencer Accessories Item Type: Accessory Shipping Weight: 0.1 Feature: 9mm Piston For Osprey/Octane Feature: Thread for Sig,HK,Walther Feature: Glock Factory Thread Barrel Optic Adjustable Objective: false Optic Reticle Illuminated: false