AICS 7.62x51/.308 (PMAG) Magazine Mount (Magnetized)
thingiverse
I've confirmed this works with both metal MDT and polymer PMAG 7.62x51/.308 magazines, as well as other shotgun magazines I have.I needed to modify the original to add the 10x3mm magnet holes (https://www.amazon.com/dp/B09S5SMFY4), as well as extending the magazine holder lips to handle various magazines without them falling out. I was able to insert the magnets with my fingers, which seems to be holding up. If they don't stay in for you, then some glue/epoxy can help.
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