ZCI Complete Gearbox with QD Spring V2 – 8mm Bearings

The ZCI Complete Gearbox with QD Spring V2 is a purpose-built drop-in solution for players seeking a reliable, field-ready gearbox assembly without the complexity of mosfet integration.

Key Features

• 8mm ball bearings – reduced friction, improved rate of fire consistency
• Quick-change spring system – field-swap spring options without full disassembly
• Standard contacts – proven reliability for trigger response and cycle efficiency
• V2 platform compatibility – direct fit for most M4/M16 AEG platforms
• Pre-assembled – ready to drop into compatible receivers

Real-World Use Cases

This gearbox suits skirmishers upgrading from stock internals, players running high-stress spring loads, and builders seeking a quality mid-tier component without mosfet programming overhead. The QD spring mechanism is particularly valuable for milsim events where quick spring adjustments between game phases are necessary.

Technical Specifications

• Gearbox type: V2 (8mm bearing)
• Spring system: Quick-change (QD)
• Contacts: Standard (non-mosfet)
• Bearing size: 8mm ball bearings

Compatibility & Upgrades

This V2 gearbox is compatible with M4, M16, and platform-equivalent AEGs. It accommodates standard V2 springs and can be paired with most compatible motors and pistons for further tuning. Standard contacts work with conventional trigger switches and battery setups.

UK Legal & Site Notes

This gearbox assembly contributes to the overall muzzle energy of your AEG; ensure your build complies with your skirmish site’s chronograph limit (typically 328 fps / 1.49 J at 0.20g). No licensing concerns for internal components in the UK.

Upgrade your V2 platform AEG with reliable ZCI engineering. Order your complete gearbox assembly from Airsoftdirect UK today.