Tested for gen 2 Magpul 5.56x45NATO magazines. Holds 4. Holes for the magnets are 10x60x3mm with 0.15mm clearance to ensure fitment. 

Magnetic Pmag Mount

Magenet Pmag Mount

Designed for use with a laser bore sighter. 

Gun rest body and clamp are remixed from the following models: 
https://www.thingiverse.com/thing:2805742
https://www.thingiverse.com/thing:3075868

Sight zeroing rest

GunRestBody.stl

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Magnetic Pmag Mount

Sight zeroing rest