M4 dual mag coupler / adaptor - remixed

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Summary

This is a remix of https://www.thingiverse.com/thing:4518666

 

Here are some improvements over the original design:

• 2mm more space between the mags (to avoid pushing mags against magwell)
• small notch in one part to fit better with "waffle" mag designs
• M5 nut fits much better - no need to fiddle with scaling or heating and stuff
• hexagonal cuts instead of circles for better printing results
• slightly increased walls for better stiffness

You will need a 5x70, DIN 912 screw plus a DIN 934 nut.