Can you use any 9mm ammo in your 9mm gun?

There were several types of 9mm ammunition made. The most common is the 9x19, also known as 9mm Parabellum or 9mm Luger. If your firearm is marked as any of those, than this is the only type of 9mm ammunition it can facilitate. If you are uncertain about which type of ammo can be used with your firearm, consult a gunsmith.