What is the ammo capacity of the M9 service pistol?

The ammunition capacity of the M9 service pistol is 15 rounds in the magazine, plus one additional round in the chamber, making it a 15+1 configuration. This capacity allows for a total of 16 rounds available for use, which is significant for military and law enforcement applications where effective firepower is essential. The M9 uses a double-stack magazine design, which contributes to this higher capacity compared to single-stack designs found in some other handguns.

The M9's capacity has been a standard feature that balances the need for sufficient firepower without overly increasing the weight or bulk of the weapon, allowing for easier handling and maneuverability.