Home / Accessory-Silencer Accessories / Rugged Suppressors OBSIDIAN PISTON .578X28 You cannot add "Gemtech PISTON GM-45 LID MK23" to the cart because the product is out of stock. Sale! Rugged Suppressors OBSIDIAN PISTON .578X28$8000 $7196 Out of stock SKU: OP001 Category: Accessory-Silencer Accessories Product ID: 30006 Description Description 17-4 Stainless Steel Related products Sale! Rugged Suppressors R3 FLASH HIDER M18X1 $10000 $8715 Gemtech GM9 THREAD REAR MOUNT M18X1RH $9100 SilencerCo DELTA 1/2X28 THREAD SPACER $1900 Gemtech ADAPTER MM9 FTM 1/2-28 $7500