The SUB-2000 is available in the following versions only: *
9mm : *Glock 17, Glock 19, S&W 59, Beretta 92, SIG 226 *
.40 Cal : *Glock 22, S&W 4006, Beretta 96, SIG 226 *
FYI, the Glock models cannot be changed to any of the other 3 versions. *The S&W, Beretta and Sigs can be switched back and forth by changing the mag catch, but none of them can be changed over to Glock.