The RetroArms CNC Gearbox for SR25 – QSC (Quick Spring Change) is a precision-engineered upgrade designed for serious airsoft techs and players who demand maximum performance and reliability. Machined from a single block of aircraft-grade aluminum (EN AW 7075 T6), this gearbox shell provides exceptional strength and dimensional accuracy, making it ideal for high-stress builds including high FPS DMR setups.
This version includes RetroArms’ renowned QSC (Quick Spring Change) system for rapid spring swaps without full disassembly. Designed for SR25 AEG platforms, it features enhanced bearing slots, radiused corners, and compatibility with standard V2 internals for easier customization.
Features
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CNC-machined from EN AW 7075 T6 aluminum (aircraft-grade)
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Compatible with SR25 AEG rifles
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Quick Spring Change (QSC) system included
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Reinforced design with radiused corners for durability
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Accepts 8mm bearings or bushings
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Improved alignment and tighter tolerances for consistent gear mesh
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Compatible with most Version 2 gearbox internals
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Black anodized finish for corrosion resistance
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Proudly made in the Czech Republic by RetroArms
Specifications
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Material: EN AW 7075 T6 Aluminum
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Compatibility: SR25 AEG platforms
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Bearing Size: 8mm
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Spring Change: QSC (Quick Spring Change)
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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 Shell for SR25 – QSC
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Mounting hardware (if included by manufacturer)
Important Notes
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Professional installation highly recommended
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Some internal tuning may be required based on brand/model compatibility
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Ensure all components (gears, bushings, selector plate) are aligned correctly during setup
Disclaimer
⚠️ This gearbox is intended for airsoft use only. Not compatible with real firearms. Always follow local laws and safety protocols.
