Z-Parts MK4 Barrel Nut for Umarex / VFC M4 GBB Airsoft

Z-Parts MK4 Barrel Nut for Umarex / VFC M4 GBB Airsoft Metal Construction MK4 Style Barrel Nut Suitable For Umarex/ VFC M4 Series Airsoft Gas Blow Back GBB Rifle Rifle Airsoft Guns