AirsoftNEXT explains why an HPA-powered airsoft MP7 is very good option as CQB primary in 2025. The Tokyo Marui MP7 AEP is often modified by enthusiasts using HPA conversions, specifically the PolarStar Jack engine, to replace its standard electric system. This upgrade provides significant performance enhancements, including increased and consistent FPS, improved trigger response, and greater air efficiency, transforming the compact platform into a highly competitive and customizable airsoft weapon.