Home / Accessory-Silencer Accessories / Gemtech THREAD PROTECTOR 1/2-28 RF You cannot add "SilencerCo 3-LUG MUZZLE DEVICE 9MM 5/8X24" to the cart because the product is out of stock. Gemtech THREAD PROTECTOR 1/2-28 RF$1800 Out of stock SKU: 12222 Category: Accessory-Silencer Accessories Product ID: 26738 Description Description 1/2-28 Thread Protector Related products Sale! Yankee Hill Machine Company SIDEWINDER PISTON 45ACP.578X28 $7495 Original price was: $7495.$7135Current price is: $7135. Gemtech ADAPTER MM9 FTM 1/2-28 $7500 Sale! Rugged Suppressors R3 FLASH HIDER 3/4X24 $10000 Original price was: $10000.$8715Current price is: $8715.