Good question. Matt answers this burning question amongst airsoft players in this Evike.com Minute Airsoft Airsoft (MOA) episode. The Hi-Capa series is the best selling airsoft pistol ever. There are third party parts, accessories, and services for this successful airsoft pistol released by Tokyo Marui and copied by others. It is also the go to pistol for action air shooters and thus, it is the most visible pistol in airsoft practical pistol competitions.