basically in the year 2009-2010 Metroarms Corp.(philippines) produce and makes 2011 modular guns for competition (ipsc) it was named MAC2011, the parts, slide,barrel, etc was made in philippines and the frame and plactic grips are made in Texas mainly called the original STI, in the year 2011, Metroarms made a deal with SPS (spain) to produce them the frame and the plastic grip and thats the birth of SPS Pantera.