How many rounds does the standard M9 Magazine hold?

• A. 12 rounds
• B. 15 rounds
• C. 16 rounds
• D. 18 rounds

Answer: (B)

The value being tested is the standard magazine capacity of the M9 service pistol. The Beretta 92/M9 uses a double‑stack 9×19 mm magazine that is designed to hold 15 rounds. This capacity strikes a balance between providing enough firepower and keeping the grip length and weapon size practical for military use. Some extended magazines exist, but they’re not considered standard issue for the M9. If you count a round already in the chamber, the pistol could have 16 rounds total, but the magazine itself is 15 rounds.