Remixed the Pmag mount to make it work with magnets. i used this M6 screw magnet… holds a full mag well. (can add grip tape to bottom if fully loaded 40 rounder… though that held well for me too).

Learay 6 Pack Rubber Coated Magnets, 26LBS Neodymium Magnet Base with M6 Threaded Studs, Strong Mounting Magnets Stud Magnet Black Rare Earth Magnets for Light Bar Mirror Camera Tool: Amazon.com: Industrial & Scientific

i didn't use the washers. just the maget on the back and the screw through the hole then tightened hard.