I'm not surprised. I likely spoke before putting my head in gear. When you consider all the relatively inexpensive tools available to us these days, I would expect that the vast majority use aluminum, which can be cast inexpensively. Why would I expect a chop saw to be any different? I have an old Milwaukee (chop saw) in storage. The more I think about it, the more I think it very well may be aluminum, too. My comments were flavored by my experiences of working in industry, where serious equipment is made of iron or steel.
Harold