In my ongoing effort to become a minimalist, I was going through a pile of magazines (mostly American Rifleman) and I found some old ones I had saved because they had articles on USPs in them. One was a 1993 HK catalog that went into detail about the testing they did on the USP, that is what made me by my first USP in '95. I'll reread them when I have a chance. Sorry the pictures are so crappy, I didn't realize they would be so small.