Which part works to release the ammunition in a double action revolver?

The cylinder release is the correct part responsible for releasing the ammunition in a double action revolver. When you activate the cylinder release, it allows the cylinder to swing out, providing access to the chambers where the ammunition is stored. This function is essential for loading and unloading the revolver.

In a double action revolver, the cylinder must be opened to insert or remove cartridges, and the cylinder release mechanism is specifically designed for that purpose. It ensures that the shooter can easily and safely manage ammunition without inadvertently discharging the firearm.

Understanding this part's function is crucial for safe handling and operation of a revolver, as it directly impacts loading and unloading procedures. The other parts mentioned, such as the action bar, ejector rod, and safety, serve different roles in the operation and safety mechanisms of the revolver, but they do not physically release the ammunition like the cylinder release does.