“In the T36 instance they literally hammered a FA carrier into a receiver in order to proclaim it a MG. They permanently modified a receiver, permanently modified a grip housing, added the FA catch, and added a FA carrier in order to enable FA. If the test is what is readily convertible then the KG99 open bolt guns that are identical to their later banned as MG twins don't pass such a test - the exact same gun is a MG and yet it is not a MG.”
Do you have a link to the details ?