Home / NFA Accessories / YHM RIFLE THREAD PROTECTOR .640 OD 1/2X28 View cart “SILENCERCO O-RING BOOSTER PACK” has been added to your cart. Out of stock YHM RIFLE THREAD PROTECTOR .640 OD 1/2X28$15.50 Out of stock Want to be notified when this product is back in stock? Notify me UPC: 816701013917 SKU: YHM-3412-B Categories: Muzzle Devices - Non Suppressor Mount, NFA Accessories Product ID: 9987 Related products DEAD AIR 1/2X28 THREAD PROTECTOR $18.99 Add to cart SilencerCo Fixed Barrel Spacer AC22 $50.15 Add to cart Dead Air Fixed Barrel Spacer DA409 $39.00 Add to cart MAGPUL DAKA SUPRESSOR POUCH MEDUIM BLACK $20.85 Add to cart