When is the locking step of a single action revolver completed?

The locking step in a single action revolver is completed when the hammer is cocked. In a single action revolver, cocking the hammer not only prepares the firearm to shoot by placing it in a ready position but also engages the locking mechanism that holds the cylinder in place. This is crucial for ensuring that the cylinder aligns correctly with the barrel for accurate firing.

When the hammer is cocked, it rotates a mechanism that locks the cylinder in position, preventing it from rotating during the firing process. This enhances safety and accuracy, as any misalignment could potentially result in a malfunction. Therefore, understanding the importance of this step in the operation of a single action revolver is critical for both safety and effective handling of the firearm.

Other options, such as pulling the trigger, installing the barrel, or loading the cylinder, do not initiate the locking mechanism and thus do not complete this essential function in the firing process.