The RetroArms CNC Gearbox M4/416 TM NGRS (8mm) is a premium CNC-machined gearbox shell designed specifically for Tokyo Marui Next Gen Recoil Shock (NGRS) M4 and HK416 platforms. Built from high-strength aluminum alloy and engineered with extreme precision, this gearbox provides unmatched durability, perfect gear alignment, and enhanced performance for high-end custom builds.
Ideal for advanced technicians and performance-focused builds, this gearbox is compatible with 8mm bearings or bushings and includes reinforced sections to handle high-torque and high-speed setups without flexing or cracking.
Features
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CNC-machined aluminum construction for maximum strength and precision
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Designed for Tokyo Marui NGRS M4 / HK416 platforms
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Compatible with 8mm bearings or bushings
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Reinforced gearbox shell for durability under heavy load
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Precisely machined for perfect gear alignment
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Includes QSC (Quick Spring Change) compatibility for easier tuning (depending on version)
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Compatible with most internal AEG components (within NGRS specifications)
Specifications
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Material: CNC Aluminum Alloy
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Compatibility: Tokyo Marui NGRS M4 / 416 platforms
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Bearing/Bushing Size: 8mm
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Type: V2 NGRS Gearbox Shell
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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 Shell M4/416 TM NGRS (8mm)
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Mounting screws and hardware (as provided by manufacturer)
Important Notes
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Professional installation required — gearbox disassembly and precision shimming are necessary.
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Verify compatibility with your NGRS internal components and receiver.
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QSC function availability depends on gearbox revision.
Disclaimer
⚠️ This product is an upgrade part intended for toys only. Not for real firearms.
