Lightweight CNC Aluminum Hopup Chamber Upgraded Kit For Ver. 2 Gearbox M4 M16 Standard Airsoft Paintball Accessories
https://www.vogueparade.com/shopping/EN/100005571/7/33045584126/lightweight-cnc-aluminum-hopup-chamber-upgraded-kit-for-ver-2-gearbox-m4-m16-standard-airsoft-paintball-accessories//