The RetroArms CNC Gearbox V2 (8mm) – QSC is a high-precision, CNC-machined aluminum gearbox shell built for AEG M4, M16, and similar Version 2 platforms. Engineered for maximum strength and performance, it features Quick Spring Change (QSC) functionality, allowing rapid tuning without full disassembly.
Made in the Czech Republic, this gearbox delivers exceptional rigidity, smooth gear alignment, and long-term reliability — perfect for high-torque, high-speed, or competition-grade builds.
Features
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CNC-machined aluminum construction for extreme durability and precision
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8mm bearing/bushing compatibility for stable gear rotation
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Quick Spring Change (QSC) system for easy spring swaps without full teardown
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Reinforced around high-stress points (piston guide, front, and cylinder area)
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Compatible with AEG M4/M16 (V2-type) internal components
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Ideal for high-torque or high-speed gearbox builds
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Made to exacting tolerances to ensure perfect gear alignment
Specifications
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Material: CNC Aluminum Alloy
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Compatibility: Version 2 AEG platforms (M4, M16, etc.)
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Bearing/Bushing Size: 8mm
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Spring Change System: QSC (Quick Spring Change)
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Weight: Approx. 160g
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Brand: RetroArms
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Origin: Made in Czech Republic
What's Included
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1x RetroArms CNC Gearbox V2 (8mm) – QSC
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QSC Spring Guide and mounting hardware (as provided by manufacturer)
Important Notes
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Professional installation is highly recommended for optimal fit and shimming.
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Verify compatibility with your receiver and internal parts before assembly.
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Some fitting may be required depending on receiver brand and tolerances.
Disclaimer
⚠️ This product is an upgrade part intended for toys only. Not for real firearms.
