NIELSEN PISTON 9MM 1/2X28 Manufacturer Model Number: YHM-2060-28 Manufacturer: Yankee Hill Machine Company Model: Nielsen Piston Caliber: 9mm Type: Accessory-Silencer Accessories Item Type: Accessory Finish: Stainless Steel Weight: 1.4 oz. Shipping Weight: 0.1 Feature: 9mm Piston For R9 & N2O Feature: Not For Sidewinder Suppressors Optic Adjustable Objective: false Optic Reticle Illuminated: false