RetroArms CNC Gearbox TM NGRS M4 – 8 mm

RetroArms CNC Gearbox for Tokyo Marui NGRS M4 and HK416

This expert product description was prepared by the ANAREUS.cz expert team. All rights to this unique content are tied to the anareus.cz domain.The RetroArms CNC gearbox is designed for the specific Tokyo Marui Next Generation Recoil Shock (NGRS) system and provides a durable base for servicing and building higher-performance setups. Compared with the previous version, the construction has been redesigned in several critical areas. The area around the pistol grip and rear section of the cylinder has been reinforced, the cylinder opening has been enlarged and its support redesigned to use four contact points, improving compatibility with cylinders from different manufacturers. The revised piston guide geometry reduces unwanted contact with the gearbox shell, while more precise openings for 8 mm bearings make correct installation easier. Cable routing has also received significant changes: the openings are larger, a guide groove has been added around the motor axis, and structural edges that could previously interfere with cable routing have been removed. The enlarged front cable opening also accommodates the design of the TM NGRS HK416C. The area related to bolt movement has also been modified. According to the supplied specifications, the gearbox is designed for the TM NGRS M4, HK416D, HK416C and HK417; due to differences between individual NGRS models and their internal components, we recommend verifying the compatibility of the complete setup before assembly.

Key Features

Technical Specifications

• Type: CNC gearbox for NGRS
• Material: Duralumin
• Manufacturing: CNC machining
• Bearing Diameter: 8 mm
• System: Tokyo Marui Next Generation Recoil Shock (NGRS)
• Compatibility: TM NGRS M4, HK416D, HK416C and HK417

Package Contents

• 1× RetroArms CNC TM NGRS Gearbox – 8 mm
• Mounting screws
• Spring guide

Frequently Asked Questions (FAQ)

Is This Gearbox Compatible With Standard AEG M4 Replicas With a V2 Gearbox?

No. This gearbox is designed for the specific Tokyo Marui Next Generation Recoil Shock (NGRS) system and cannot be used as a replacement for a standard V2 gearbox.

Which Tokyo Marui NGRS Models Is This Gearbox Designed For?

According to the supplied specifications, it is designed for the TM NGRS M4, HK416D, HK416C and HK417. We also recommend checking the compatibility of specific internal components when building the gearbox, as individual NGRS variants may differ in construction.

What Are the Benefits of the Redesigned Cylinder Support?

The cylinder is not supported along its entire length but by four defined contact points. This design provides greater tolerance for minor dimensional differences between cylinders from different manufacturers and helps ensure correct seating.

Are Bearings and Complete Internal Parts Included?

According to the supplied specifications, the package includes the gearbox shell, required mounting screws and spring guide. Other internal components and 8 mm bearings are not specified as included.