Z-Parts MK16 M-Lok 10.5 inch Rail for GHK M4 GBB Airsoft Rifle (w/ Barrel Nut/ DDC)

Z-Parts MK16 M-Lok 10.5 inch Rail for GHK M4 GBB Airsoft Rifle (w/ Barrel Nut/ DDC) Metal Construction Airsoft Handguard With M Lok System 20mm Picatinny Rail on Top Suitable For GHK M4 Gas Blow Back GBB Airsoft Rifle Transforms the look of your M4 into a URG-I style upper receiver A popular choice among airsoft enthusiasts seeking a realistic URG-I style build