3D Model 1:1 Lower G&G Combat M4 AEG · STEP File

High-fidelity 3D model of the G&G M4 AEG lower receiver, reproduced at 1:1 scale from direct measurements of the original part.
Delivered in STEP (.stp) format, ready to use in any CAD software or as a base for modification, adaptation, or 3D printing projects.

This is not a print or an approximation: it is an accurate reverse-engineered model, intended for designers, makers, and technicians who need a precise reference of the G&G lower as a starting point.

What’s included

• 1× STEP (.stp) file of the G&G M4 AEG lower receiver at 1:1 scale
• Complete geometry with holes, channels, and dimensional references true to the original
• Compatible with: Fusion 360, SolidWorks, FreeCAD, Onshape, Rhino, and any STEP-compatible CAD software

What it’s for

• Reference base for designing M4 AEG lower modifications and adaptations
• Tolerance checking and dimensional compatibility verification with other components
• Starting point for custom lowers, HPA conversion kits, or other gearbox parts
• Reverse engineering documentation for personal or commercial projects

Verified compatibility

Component	Reference
Original brand	G&G
Replica type	M4 AEG
Model scale	1:1 (real dimensions)
Delivery format	STEP (.stp)
Compatible software	Fusion 360, SolidWorks, FreeCAD, Rhino, Onshape

Usage notes

• This model is intended as an engineering reference, not as a directly printable part
• If you use it as a base for a printable lower, check the Universal Gearbox V2 Lower models available in the store for mounting and hardware references
• Small dimensional variations may exist between different generations of the G&G lower. This model corresponds to the version directly measured by the author

About the author’s logo

This model is shared openly as a resource for the community.
If you use it as a base for your own work, keeping the author’s logo is a way to acknowledge their effort.
It’s not mandatory, but it is greatly appreciated. 🙏

Manuals and support

If you have questions about using the STEP file or want to combine this model with any of the available alignment kits, you can check the Manuals section on the website or ask directly in the project’s Discord server.