The mod adds the Naval Revolver to the single player game. You can fully customize it at the gunsmith and even buy it in Valentine and Saint-Denis.
Installation: Extract the archive to the lml folder so that the path is "rdr2/lml/navy_revolver_sp ». Make sure you have Lenny's Simple Trainer or Outfit Changer to load all multiplayer components. Otherwise, the revolver will not be displayed.