There is quite a bit of contention on this point.
I think it is generally agreed upon that the entirety of the MP600 series are US made.
The Freehand/Diesel and Flik are under debate. Some say they are made completely in China, some say the Plier heads are made in China and some say these models are made in the US.
FWIW, the packaging for my Freehand and Diesel say "Made in the USA" and the plier heads look significantly different than the Chinese models. Not sure about the Flik.