Home / Accessory-Silencer Accessories / Rugged Suppressors OBSIDIAN PISTON .578X28 You cannot add "SIG SAUER FLASH HIDER CL 5.56MM 90 DEG" 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! Yankee Hill Machine Company SIDEWINDER PISTON 40SW 9/16X24 $7495 $7135 Sale! Yankee Hill Machine Company SIDEWINDER PISTON 45ACP.578X28 $7495 $7135 Sale! Yankee Hill Machine Company SIDEWINDER PISTON 45ACP 16X1LH $7495 $7135