The RetroArms CNC Gearbox V2 – 8mm Bearings – QSC is a premium-grade gearbox shell designed for M4/M16 AEG platforms that use Version 2 gearboxes. Machined from a single block of EN AW 7075 T6 aluminum, this gearbox offers extreme durability, high precision, and reinforced structural integrity, ideal for demanding builds such as high-RPS or DMR setups.
This model comes with pre-installed 8mm steel bearings and features the Quick Spring Change (QSC) system, allowing fast spring swaps without full disassembly. Enhanced with radiused corners and precisely machined bearing holes, this gearbox is built for longevity and top-tier performance.
Features
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Compatible with most M4/M16 AEGs (Version 2 gearbox)
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CNC-machined from EN AW 7075 T6 aircraft-grade aluminum
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Pre-installed 8mm steel bearings for smoother gear rotation
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Integrated QSC (Quick Spring Change) system
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Radiused corners to prevent stress fractures
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Tight tolerances for better alignment and gear meshing
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Anodized surface finish for added protection
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Manufactured in the Czech Republic by RetroArms
Specifications
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Material: EN AW 7075 T6 Aluminum
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Gearbox Version: V2
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Compatibility: M4/M16 AEG platforms
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Bearing Size: 8mm (steel bearings included)
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Spring Change: Quick Spring Change (QSC)
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Weight: Approx. 120g
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Brand: RetroArms
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Origin: Czech Republic
What’s Included
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1x CNC Gearbox V2 – QSC with pre-installed 8mm bearings
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Mounting hardware (if included by manufacturer)
Important Notes
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Professional installation recommended
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May require tuning depending on parts used (gears, tappet plate, selector plate, etc.)
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Ensure proper shimming and alignment for optimal performance
Disclaimer
⚠️ This is an airsoft upgrade part intended for toy use only. Not compatible with real firearms.
