I recently had my Steyr M9's slide trued after a mishap with an extended IGB barrel. The barrel was solid and appears to have been made of a much stronger metal than the slide. While the slide was being machined, my gunsmith commented that the metal appeared to be of very poor casting quality (I didn't ask further but I read it as impurities/air bubbles possiblity contributing to the warping I experienced). Does anyone know what kind of Metal is used on the slides? I'm interested in researching its thermal properties as well (http://www.defensereview.com/modules.ph ... nt&sid=227).