Which type of ammunition is NOT used in the M9 pistol?

The M9 pistol, which is a standard issue handgun for the United States Armed Forces, is typically designed to fire specific types of ammunition. Among the choices presented, M882 ball ammunition is the standard 9mm ball round used with the M9, while M802 is a training round also compatible with the pistol. The M821 is a different type of round that is often used for training purposes.

In contrast, the M193 ball ammunition is a 5.56mm round designed for use in rifles such as the M16 and M4, not pistols. Therefore, it is not suitable for use in the M9 pistol. This distinction is important to understand the compatibility of different ammunition types with specific firearms, ensuring proper training and operational effectiveness.