MechLabs Nexxus SA HPA Engine Gearbox Kit

Pure Mechanical Power, No Batteries Needed

The MechLabs Nexxus SA HPA Engine Gearbox Kit is a revolutionary drop-in upgrade designed for serious airsoft players who demand precision, durability, and complete mechanical reliability. This full-mechanical HPA system operates without any electronics or batteries, delivering consistent performance powered entirely by compressed air. Compatible with most Version 2 M4/AR15 AEG gearboxes, it supports both semi and full auto fire modes via selector switch, offering intuitive and responsive control right out of the box.

High Efficiency Meets Elite Performance

Built with a CNC-machined aluminum body, the Nexxus SA is lightweight yet rugged enough for intense field action. It features an adjustable trigger with slip-resistant grooves for superior tactile control and an ultra-fast trigger response for rapid follow-up shots. Optimized for air efficiency, this engine can deliver up to 3,000 shots from a single 48/4500 HPA tank, making it one of the most efficient systems available for players who value sustained combat performance.

Customizable, Drop-In Ready HPA Upgrade

Whether you're running a CQB build or a high-speed field rifle, the adjustable rate of fire (14–36 RPS) lets you fine-tune performance to your playstyle. The Nexxus SA comes pre-installed with an M4 nozzle and supports other Version 2 nozzles (sold separately) for added versatility. It's fully drop-in ready for use with an external regulator, and for those seeking an all-in-one solution, an optional stock tank kit with built-in regulator is available. Join the HPA revolution with a truly mechanical engine built for peak performance.

Specifications

• Brand: MechLabs
• Tank Compatibility: Up to 48/4500 (not included)
• Shots per Tank (w/ 48/4500): 3,000
• Fire Rate (Adjustable): 14–36 RPS
• Compatibility: Most Ver.2 compatible gearbox Airsoft AEGs
• Nozzle Included: M4 (other Ver.2 nozzles sold separately)
• Color: Blue

Features

• Full mechanical engine with no batteries or electronics required
• Durable CNC-machined aluminum body for lightweight strength
• Selectable semi and full automatic firing modes via selector switch
• Adjustable trigger with slip-resistant grooves for added control
• Ultra-fast trigger response for high-performance shooting
• Highly air-efficient design delivering over 3,000 shots per tank
• Drop-in compatibility with M4/AR15 AEGs using Ver.2 gearboxes
• Pre-configured with M4 nozzle; supports other Ver.2 nozzles
• Ready for external HPA regulator setups
• Optional stock tank kit available with built-in regulator
• Ideal for players seeking a pure mechanical HPA upgrade solution