True and you can go 9-mm. 40 S&W, .357 Sig and .45 ACP with it in both a full size and carry configurations.
It will be a 9mm. They will be compatible with NATO rounds.
From my research, the best mix of stopping power and capacity is the 10mm round. I believe the FBI adopted it, then had to abandon it, because the FEMALE agents couldn’t handle the recoil.