[GreyFriar]

Is the M17 still 9mm like the M9?

[CodeToad]

Yep. Both are 9mm.

[Magnum44]

I dont know how the military supply plans to handle it, but the Sig can accommodate swapping barrels/parts out for other calibers, like 45ACP. Special ops groups may have this type of option, but I thought special ops guys could pretty much customize their kit before now anyway.