Home / Accessory-Silencer Accessories / Dead Air Armament FN 5.7 THREAD ADAPTER 1/2X28 View cart “Yankee Hill Machine Company SIDEWINDER PISTON 45ACP 16X1LH” has been added to your cart. Dead Air Armament FN 5.7 THREAD ADAPTER 1/2X28$4500 Out of stock SKU: DA422 Category: Accessory-Silencer Accessories Product ID: 33718 Description Description For FN 5.7Requires aftermarket barrelWill not work on OEM barrel Related products Sale! Rugged Suppressors R3 FLASH HIDER M18X1 $10000 $8715 Gemtech THREAD PROTECTOR 1/2-28 RF $1800 Sale! SilencerCo 3-LUG MUZZLE DEVICE 9MM 5/8X24 $8900 $8211 Sale! Yankee Hill Machine Company NIELSEN PISTON 9MM M13.5X1LH $7495 $7135