Home / Accessory-Silencer Accessories / Rugged Suppressors OBSIDIAN PISTON .578X28 You cannot add "Gemtech ADAPTER GM-45/BLACKSIDE 1/2-28" to the cart because the product is out of stock. Sale! Rugged Suppressors OBSIDIAN PISTON .578X28$8000 Original price was: $8000.$7196Current price is: $7196. Out of stock SKU: OP001 Category: Accessory-Silencer Accessories Product ID: 30006 Description Description 17-4 Stainless Steel Related products Sale! SilencerCo BRAVO ANCHOR BRAKE 458CAL BLK $9400 Original price was: $9400.$8606Current price is: $8606. Gemtech THREAD PROTECTOR 1/2-28 RF $1800 SilencerCo DELTA 1/2X28 THREAD SPACER $1900 Sale! Dead Air Armament XENO MOUNT FLASH HIDER 5/8X24 $8900 Original price was: $8900.$8472Current price is: $8472.