Guarder Steel Valve Knocker for Marui Hi-Capa GBB

Guarder Steel Valve Knocker for Marui Hi-Capa GBB Steel Construction (Defric Coating) Design for Upgrade the Original Parts More Durable Suitable for Tokyo Marui Hi-Capa 5.1/ 4.3 Series Airsoft Guns Gas Blow Back GBB Pistol