Home / Accessory-Silencer Accessories / Yankee Hill Machine Company SIDEWINDER PISTON 9MM 13.5X1LH Sale! Yankee Hill Machine Company SIDEWINDER PISTON 9MM 13.5X1LH$7495 Original price was: $7495.$7135Current price is: $7135. Only 1 left in stock Yankee Hill Machine Company SIDEWINDER PISTON 9MM 13.5X1LH quantity Add to cart SKU: YHM-3245-M Category: Accessory-Silencer Accessories Product ID: 38443 Description Description 9mm Piston For Sidewinder Related products Gemtech GM9 THREAD REAR MOUNT M18X1RH $9100 Sale! SilencerCo BRAVO ANCHOR BRAKE 30CAL BLACK $9400 Original price was: $9400.$8606Current price is: $8606. Sale! Dead Air Armament HUB DIRECT THRD MNT 5/8X24SIG $8900 Original price was: $8900.$8351Current price is: $8351. Sale! Dead Air Armament XENO MOUNT FLASH HIDER 5/8X24 $8900 Original price was: $8900.$8472Current price is: $8472.