ZCI CNC Gear Set for SR25 – 18:1 Ratio

The ZCI CNC gear set for SR25 is a precision-engineered internal upgrade designed to replace worn or weak stock gears in your SR25 platform AEG. ZCI’s reputation for tight tolerances and quality CNC machining makes this an excellent choice for skirmishers and technicians seeking improved longevity and consistency.

Key Features

• CNC-machined precision – tight tolerances for smooth, reliable engagement
• 18:1 gear ratio – balanced rate of fire with responsive semi-auto trigger
• SR25 gearbox compatibility – direct fit for standard SR25 platforms
• Durable construction – resists wear and premature tooth stripping
• Drop-in replacement – simplifies gearbox rebuild and maintenance

Real-World Use Cases

This gear set suits technicians upgrading stock SR25 AEGs, skirmishers seeking improved trigger response and reliability, and milsim players who demand consistent semi-auto performance over extended play sessions. It’s equally valuable as a warranty-safe replacement for damaged internals.

Technical Specifications

• Gear Ratio: 18:1
• Manufacturing: CNC-machined steel
• Compatibility: SR25 gearbox
• SKU: ZCCL-36

Compatibility & Upgrades

Confirm your gearbox version before purchase—this set is designed for standard SR25 platforms. Pair with compatible springs, motor upgrades, and shimming for optimised performance. ZCI gears work with most aftermarket trigger assemblies and piston arrangements.

UK Legal & Site Notes

Internal gearbox upgrades are legal to own and fit in the UK. Always check with your local site regarding performance limits; a gear upgrade alone doesn’t typically raise FPS, but improves consistency and longevity. Have your work checked before play.

Ready to upgrade your SR25? Stock this precision ZCI gear set and keep your AEG performing reliably on the field.