NIELSEN PISTON 9MM 1/2X36Yankee Hill Machine Company Nielsen Piston 9mm - Stainless SteelSKU: YHM-2060-36$80.95PriceQuantity*Add to CartSpecifications Manufacturer model: YHM-2060-36 UPC: 841812101574 Type: Accessory-Silencer Accessories Caliber / gauge: 9mm Overall length: 5.5 Finish: Stainless Steel Weight: 1.4 oz. Feature 1: 9mm Piston For R9 & N2O Feature 2: Not For Sidewinder Suppressors