At the Mechlabs' booth during the MOA Exhibition Taiwan 2024 is the Nexxus HPA Engine that is a powerful, battery-free upgrade for your M4/AR15. This full-mechanical engine offers both semi-automatic and full-automatic fire modes, activated by a simple selector switch. Powered by an HPA tank, it delivers ultra-fast trigger response and impressive efficiency, capable of firing over 3000 shots on a single 48/4500 tank fill.