Home / Accessory-Silencer Accessories / Rugged Suppressors OBSIDIAN PISTON .578X28 View cart “Rugged Suppressors R3 FLASH HIDER M18X1” has been added to your cart. 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! Yankee Hill Machine Company NIELSEN PISTON 9MM M13.5X1LH $7495 $7135 Sale! Yankee Hill Machine Company SIDEWINDER PISTON 45ACP 16X1LH $7495 $7135 Sale! Yankee Hill Machine Company SIDEWINDER PISTON 40SW 9/16X24 $7495 $7135 SilencerCo DELTA 1/2X28 THREAD SPACER $1900