I think the title says it all. I have a dozen mags for my P226 MK25. One of the mags no longer locks the slide back when empty. Some stats:
8 of the mags are presumably Checkmates with "Made in USA"
2 of the mags are Mec-Gar with "Mec-Gar" and "Made in Italy"
2 of the mags have "Made in...