Which feature is characteristic of the action type of the 9-mm M9?

The 9-mm M9 pistol is characterized as a "single or double action" firearm. This means that it can be fired in both single-action mode and double-action mode, providing versatility in operation.

In double-action mode, pulling the trigger both cocks the hammer and releases it to fire the round, which is beneficial for quicker follow-up shots and for ease of carry since the hammer can remain down. In single-action mode, the hammer must be manually cocked before firing, which allows for a lighter trigger pull and improved accuracy.

This dual capability is one of the defining features of the M9, catering to different shooting preferences and scenarios, making it adaptable for various operational needs. Understanding this feature is crucial for users to effectively manipulate the handgun, ensuring readiness and accuracy in use.