Home / Accessory-Silencer Accessories / Rugged Suppressors OBSIDIAN FIXED MOUNT .578×28 View cart “SilencerCo DELTA 1/2X28 THREAD SPACER” has been added to your cart. Sale! Rugged Suppressors OBSIDIAN FIXED MOUNT .578×28$8000 $7196 Out of stock SKU: OF007 Category: Accessory-Silencer Accessories Product ID: 30000 Description Description .578X28Designed for Fixed Barrels Related products Sale! Yankee Hill Machine Company SIDEWINDER PISTON 45ACP 16X1LH $7495 $7135 Sale! Yankee Hill Machine Company SIDEWINDER PISTON 40SW 9/16X24 $7495 $7135 Sale! Rugged Suppressors R3 FLASH HIDER M18X1 $10000 $8715 SilencerCo DELTA 1/2X28 THREAD SPACER $1900