The example photo likely shows a custom hammer pin, probably tapped to accept a small screw - that is what holds on the mag lock.
But featureles may be the way to go - otherwise get ready for some custom fabrication.
Xtreme Precision makes tapped/threaded hammer and trigger pins - all you need is a mag block and a longer screw to match these threads.

You could make/carve the block from wood - at least a prototype, then you could use it to make a 3D model.
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