3d printed sig mpx


3D Printable SIG MPX

Joining Sig Sauer in Pissing Off BATFE

If there was one firearm that put a twist in BATFE’s knickers it’s definitely been the MPX; triggering knee-jerk reactions and lawsuits from the moment it was released. Why not join in on the fun? The MEPR-X (MPX Equivalent Printed Receiver) is just the ticket any builder needs to rub it in their noses, featuring the same engineering genius that won Sig Sauer their Army contracts.

Developed by Vinh Nguyen, responsible for a truly impressive number of hard-hitting releases, this project is perfect for anyone looking for a sleek and modern PCC to add to their arsenal.

In The Wild



MEPR-X Technical Specs

The files are designed to accommodate PLA+ as a minimum, and documentation recommends specific print settings. Durability may vary based on selected print settings and printing materials.

The design is meant to support OEM MPX uppers and standard AR-15 lower parts. Due to the MPX’s unique engineering (gas-operated rotating-bolt), parts kits are rare, and though documentation admits compatibility with EVO 3, AK-9, and Colt magazines should be possible, the MEPR-X is only compatible with Sig Sauer-branded MPX magazines as-released.

MEPR-X Parts List


  • Complete MPX upper receiver
  • MPX handguard
  • Complete AR-15 LPK


  • 2 – M4 steel hex nut
  • 2 – M4 x 30mm socket head screw


  • Punch set
  • Power bit set (Metric and SAE)
  • Metric drill bit set
  • Flathead screwdriver (optional, recommended)

MEPR-X Build Instructions

The reliable bane of BATFE’s existence, the MEPR-X is the best way to experience the revolutionary engineering of the MPX at home. Download and build one today!

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DISCLAIMER: 3D STL files are for learning and documentation purposes only. The users of this website and files need to be aware of all applicable local, state, federal and regional laws. 3D Gun Builder does not encourage, condone, or promote any illegal activity.

3D Gun Builder ( does not host, provide, develop, and/or have any affiliation with the firearm STL files or All files are hosted by a third party.

Kem Regik
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