Wyhaq shows how to use Glock gas magazines with the Marui Hi-Capa GBB with this Universal Pistol Adapter... "The Universal pistol adapter is an amazing new product releasing on April first. This adapter allows you to use your hicapa with glock magazines. This is designed for the tokyo marui hicapa and is an upgrade part for all tm spec compatible replicas. This is actually a very easy upgrade modification to do and I am very excited about it."