I read the link. Thank you for providing.
Vendor www.glockparts.com refused to ship replacement tubes and springs to repair magazines. Magazines can be repaired and in worst case a block can be installed to meet legal requirements but owner rufused to ship parts and suggested i ask police what is legal.
More than insulting the fact is police do not understand the law. That is why attorneys assist people in legal matters due better understand. They sell mag blocks online and these can be used to meet legal requirements.