Home / Accessory-Silencer Accessories / Yankee Hill Machine Company NIELSEN PISTON 9MM 1/2X28 Sale! Yankee Hill Machine Company NIELSEN PISTON 9MM 1/2X28$7495 Original price was: $7495.$7135Current price is: $7135. In stock Yankee Hill Machine Company NIELSEN PISTON 9MM 1/2X28 quantity Add to cart SKU: YHM-2060-28 Category: Accessory-Silencer Accessories Product ID: 46699 Description Description 9mm Piston For R9 & N2ONot For Sidewinder Suppressors Related products Gemtech THREAD PROTECTOR 1/2-28 RF $1800 Gemtech ADAPTER MM9 FTM 1/2-28 $7500 Sale! Dead Air Armament XENO MOUNT FLASH HIDER 5/8X24 $8900 Original price was: $8900.$8472Current price is: $8472.