Retro Arms V2 Quick Change Gearbox System – CNC Machined 8mm Bearings

Upgrade your airsoft rifle’s reliability with the Retro Arms CZ gearbox shell—a robust solution designed for high-performance M4/M16 AEG systems. Engineered from aerospace-grade EN AW 7075 T651 aluminum via precision CNC machining, this shell delivers unmatched strength and resilience compared to standard plastic alternatives. Strategic reinforcement at critical stress points ensures longevity even under extreme conditions, while stainless steel bolts enhance durability during prolonged use with powerful M160 springs.

The standout innovation lies in its rapid-swap ball-bearing spring guide system, enabling effortless spring changes in mere minutes without full disassembly—a game-changer for competitive players needing quick adjustments mid-skirmish. Its pre-radiused cylinder windows optimize impact force distribution, reducing wear on internal components and extending part lifespan. Deeper wire channels along the base improve gear retention and minimize friction-related damage during high-rate-of-fire scenarios.

Designed for compatibility with Tokyo Marui, G&P, Matrix, and similar M4/M16 series rifles (with potential minor modifications), this shell adapts seamlessly to your setup while maintaining structural integrity. The durable anodized finish not only resists scratches and corrosion but also ensures a professional look that withstands rigorous field use.

Whether you’re preparing for intense airsoft events or daily training sessions, the Retro Arms CZ gearbox shell combines military-grade materials with smart engineering to outperform conventional designs. Ideal for players seeking a reliable upgrade that balances power handling and ease of maintenance, this shell is built to handle the demands of high-impact airsoft engagements without compromising on durability or performance.