What is typically the last step in the proper cleaning of a firearm?

The last step in the proper cleaning of a firearm is to apply oil to the mechanism. This step is crucial because after the cleaning process, where solvents or other cleaning agents are used to remove fouling, dirt, and residue, it is important to protect the metal surfaces from corrosion and ensure smooth operation. Applying oil creates a thin protective layer that guards against moisture and contaminants that could lead to rust or enhance wear over time. This not only preserves the integrity of the firearm but also ensures that it operates efficiently for its next use. The application of oil is a final touch that enhances both protection and functionality, making it an essential concluding step in the maintenance of the firearm.