NIELSON BOOSTER ASSEMBLY NO PISTON Manufacturer Model Number: YHM-2055 Manufacturer: Yankee Hill Machine Company Model: Nielson Booster Type: Accessory-Silencer Accessories Item Type: Accessory Shipping Weight: 0.3 Feature: Piston Not Included Feature: Fits 1-3/8"x24 Tubes Feature: For Handgun Calibers Only Optic Adjustable Objective: false Optic Reticle Illuminated: false