Miller has been out sourcing items from China for some time. Two products I know for sure are the Spoolmate 3035 & 3045 spoolguns. Here ia a link to the Chinese manufacturer (Fengli). Read the 2nd paragraph in the lower portion of the page next to the pic of the stud welding gun about the spoolmate guns.
And at the bottom of the page there is an advertisement for Miller. Some older established US companys with a good name brand trick you into believing that you are buying a product made in the US when in reality it is made in china with their name brand / logo stamped on it.
http://www.globalpowertools.com/welding_gun.htm