HPA M4 Mag Adapter (G Series) - BlackBuilt for speed and consistency, the G Series adapter combines durability, precision, and smooth operation in a lightweight form factor. Designed with players in mind, every element of the adapter delivers practical advantages on the field. Key Features: Standard G Series GBB Pistol Platform Designed for seamless integration with Tokyo Marui, WE, Action Army, and Krytac GBB pistol platforms, this adapter provides exceptional cross brand versatility