EAA doesn't make them, they only import them. The EAA autos are made by different vendors depending on which one you get. The better reviewed ones are made by Tanfoglio in Italy, but they also import autos made in Serbia/Frmr Yugoslavia.

The revolvers are made by Arminius in Germany. They have a zinc alloy frame, unless things have changed. The Magnum ones may have an all steel frame. I haven't owned one, from what I've heard customer service from EAA isn't always the best and QC on the German revolvers varies a bit. They are supposedly better made than the old RGs of course, but I wouldn't expect one to last as long as a steel (or even ord. grade alum. or exotic) framed gun.