The Gatalog presents:
The Hochul 3D Printable AR15 Magazine System
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I don't know that we've got a reference STEP, but you'd be interested in the Hochul mag: https://guncadindex.com/detail/Hochul_Mag_AR15:f
u/Turdinamicrowave · 2023-03-02 01:30:43 UTC · score 1
https://grabcad.com/library/the-hochul-3d-printable-ar15-magazine-system-1
u/Standard-Royal-319 · 2023-04-07 23:09:01 UTC · score 2
I would look into the 'Hochul 3D Printable AR15 Magazine System'. it sails on the odd seas and according to the description: "All components are compatible with a factory gen 3 PMAG".