I understand the Steyr M40 was the first pistol on the market, then the M9. I'm new to the Steyr as I've been a Glock owner (8) and have a 357Sig bbl for my G35 also my G23. My duty gun is a Glock 22 .40 short & weak.LOL Due to the fact the M40 was first do both M40 & M9 use the same frame and is it possible to install a 357Sig bbl in a M9. I know in the Glock the orginal weapon must be a 40S&W to install the Sig bbl, but don't know much about the Steyr other than what I've read. Thanks, any info would be helpful.