I thought one big selling point he pushes is the made in the USA aspect. What´s all this China stuff? I have nothing against China, or products from there, but it seems if a company pushes hard as a domestic product in their advertising, it should be made domestically. Why can't he find an American mold maker and metal worker?
I believe it's more a case of "assembled in USA". He is clearly using Chinese vendors and factories to have the parts manufactured and boards printed, etc.
Shipping probably works out well for him because with unassembled products he can get huge numbers of parts and components in a small part of a container, whereas the assembled and boxes strobes, for instance, would take up a lot more space and ultimately cost more for container space.

