According to the USA Steyr web page, the M-series mags work for both 9mm and .40 SW: "This Magazine will work will the following calibers:
.40 S&W 12 Round and .9mm 14 Round".
Is that accurate? Can I load my M9 mags with .40 cartridges & then shoot them in a M40?
.40 S&W 12 Round and .9mm 14 Round".
Is that accurate? Can I load my M9 mags with .40 cartridges & then shoot them in a M40?