Home / Accessory-Silencer Accessories / Yankee Hill Machine Company SIDEWINDER PISTON 45ACP.578X28 View cart “Gemtech GM9 THREAD REAR MOUNT M18X1RH” has been added to your cart. Sale! Yankee Hill Machine Company SIDEWINDER PISTON 45ACP.578X28$7895 Original price was: $7895.$7188Current price is: $7188. Only 1 left in stock Yankee Hill Machine Company SIDEWINDER PISTON 45ACP.578X28 quantity Add to cart SKU: YHM-3225-28 Category: Accessory-Silencer Accessories Product ID: 24695 Description Description 45 ACP Piston For Sidewinder Related products Sale! Rugged Suppressors R3 FLASH HIDER 9/16X24 $10000 Original price was: $10000.$8715Current price is: $8715. Sale! Rugged Suppressors M2 BRAKE 5/8X24 $10000 Original price was: $10000.$8715Current price is: $8715. SilencerCo O-RING BOOSTER PACK $900 Sale! Dead Air Armament HUB DIRECT THRD MNT M18X1.5 AI $8900 Original price was: $8900.$8351Current price is: $8351.