1:1 scale 3D model of the internal gearbox (inner chassis) of the Tokyo Marui MP7A1 GBB, delivered in STEP format for CAD design, reverse engineering, custom part development, or upgrade components.
This resource is intended for makers, technicians, and designers who want to create parts compatible with the internal mechanics of the TM MP7 GBB without physically disassembling the replica.
What’s Included
- STEP file (.step / .stp) containing the full 3D model of the TM MP7A1 GBB gearbox/inner chassis.
- Geometry faithful to the real dimensions of the original Tokyo Marui replica, including functional areas such as the bolt, trigger bar, sear, loading nozzle, and internal chassis.
- Compatible with major CAD software: Fusion 360, FreeCAD, SolidWorks, Rhino, and any software supporting STEP format.
What is it for?
- Designing custom upgrade or reinforcement parts (reinforced sear, trigger bar, backplate, chassis, etc.) with precise fit to original tolerances.
- Creating internal adapters, mounts, or accessories for the MP7 GBB.
- Studying the mechanical system before performing modifications or repairs on the physical replica.
- Reference base for 3D printing or CNC machining of compatible parts.
Reference Specifications (Original TM MP7A1 GBB)
| Parameter | Value |
|---|---|
| Manufacturer | Tokyo Marui |
| System | Gas Blow Back (GBB) |
| Overall length | 382 mm (stock folded) / 588 mm (extended) |
| Inner barrel length | ~165 mm |
| Caliber | 6 mm BB |
| Fire modes | Semi / Full Auto / Safe |
| Recommended gas | 134a / Green Gas |
| Magazine capacity | 40+1 rounds |
| File format | STEP (.step / .stp) |
About the Logo
This model has been created and shared freely for the community.
If you use this file in your projects, keeping the author’s logo is the best way to support the work behind it. It is not mandatory, but it helps recognize the effort and encourages sharing more designs with the community. 🙏
Notes
- This model is an engineering reference for airsoft use. It is not a directly printable part or a ready-to-use functional kit.
- Final tolerances may require fine adjustment depending on the manufacturing process used (FDM, SLA, CNC, etc.).
- This file is not an official Tokyo Marui product and has no affiliation with the brand.
Manuals & Community
If you have questions about the internal assembly of the TM MP7 GBB or want to share your designs based on this model, you can find more resources in the Manuals section of the website or on the project’s Discord server.
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