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The ones that I have from ruger were made by metalform and are welded on they are also drilled to put a bumper pad on them

The base plate is welded but pre drilled to add a bumper to the base plate same as the 45 magazine. (https://www.youtube.com/watch?v=w-KgEbB0_3o)

Removable base mags here : (http://www.checkmatemagazines.com/index.php?option=com_hikashop&ctrl=product&task=show&cid=48&name=cm10mm-9-s-rb-magazines&Itemid=298)

The ones that I have from ruger were made by metalform and are welded on they are also drilled to put a bumper pad on them