When by my local Gun shop looking at some .308's when I saw a Sub2000 on the shelf. They had several this month but all were Berretta 92. I already have a Gen 1 in Glock .40, but I wanted Gen 2 to go with my Gen 2 9mm Glock. While checking to make sure my old Glock mags would fit (22 rd) I noticed that my 9mm Glock mags would also fit and vice versa. The bolt is marked in real small letters 40 S&W. Am I wrong that you can load 9 mm Glock mag into 40 Cal and .40 Glock mags into 9mm SUB2000. My .40 S&W is marked Glock 19/23 and my 9mm is marked 17/22. I don't think the 40 will fit into the 9's chamber, but maybe the 9 might chamber in the 40.