Gearbox Parts

HPA adapter for KJ/WE gas replicas from Action Army. High quality metal construction. Simply unscrew your existing magazine fill valve and replace...

CNC-Machined from 303 Stainless Steel. Direct replacement for factory gas fill valve with no modifications required Compatible with Foster 2-Ser...

HPA adapter for KWA/KSC gas replicas from Action Army. High quality metal construction. Simply unscrew your existing magazine fill valve and repla...

HPA adapter for Tokyo Marui gas replicas from Action Army. High quality metal construction. Simply unscrew your existing magazine fill valve and r...

STORM HP-R: The Ultimate V2 HPA Conversion Kit. Engineered in France by Storm, the HP-R system is a streamlined, "thought-through" solution for p...