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You should always clean the chamber of a weapon through the:

  1. Chamber end

  2. Back end

  3. Exterior Rails

  4. Muzzle end

The correct answer is: Chamber end

Cleaning the chamber of a weapon through the chamber end is the correct approach because it allows for access to the interior portions of the chamber where fouling and debris tend to accumulate. This method ensures that the cleaning tool can effectively remove any residue, ensuring proper functioning of the firearm. Accessing the chamber from the chamber end allows for a more direct and thorough cleaning experience, as it minimizes the risk of pushing contaminants further into the mechanism of the firearm. In contrast, attempting to clean from the back end could be less effective because it might not properly address buildup right at the chamber itself. Exterior rails and muzzle end access do not provide adequate exposure or direct cleaning capabilities for the chamber area specifically, which can lead to incomplete maintenance. Therefore, utilizing the chamber end for cleaning is the most effective method to maintain the firearm's reliability and safety.