Retro Arms CZ CNC Billet 8mm Version 2 Gearbox Shell for Airsoft M4/M16 AEG Rifles

Upgrade your airsoft rifle’s heart with precision-engineered strength. The Retro Arms CZ CNC Billet 8mm Version 2 Gearbox Shell is machined from premium solid 7075-T6 aluminum billet stock in the Czech Republic, offering unparalleled rigidity compared to weaker cast shells – a must for high-stress builds like DSG setups or high-FPS M4/M16 AEG platforms.

Designed specifically as a drop-in replacement for Tokyo Marui-spec V2 gearboxes found in countless airsoft rifles, this shell provides superior structural integrity to handle powerful springs and high-torque motors without flexing or cracking over time. The reinforced bearing supports are precisely machined to accommodate larger, more durable 8mm bearings, significantly enhancing gear alignment stability and reducing friction for smoother operation and longer component life.

Key features include pre-tapped holes for common Retro Arms trigger boards and optical sensors (no drilling required!), precisely cut cylinder windows ensuring optimal compression seal alignment, and meticulous QC guaranteeing perfect dimensional accuracy out of the box.

Stop worrying about gearbox failure during intense skirmishes or demanding upgrades. Invest in the proven resilience of a genuine Retro Arms CNC Billet shell. Experience smoother cycling, increased durability under load, and ultimate peace of mind for your critical airsoft M4/M16 V2 gearbox upgrade.