5KU Mount for Marui GBB Hi-CAPA 5.1/4.3 GBB Airsoft

5KU Mount for Marui GBB Hi-CAPA 5.1/4.3 GBB Airsoft Metal Construction 20mm Picatinny Rail System Top & Bottom For mount RDS, Flashlight and Laser Suitable For Hi-Capa Series Gas Blow Back GBB Pistol Airsoft Guns