Please make sure to have all of the requirements on the mod page before installing.
Drag and drop the "Pepper-Box Revolver" folder into your "lml" folder that is inside of your Red Dead Redemption 2 game directory, then please make sure to delete the matching files inside of this merge that are inside of Jack Swede's Revolving Rifle mod. If you encounter any issues with installing please leave a comment on the mod page and DO NOT message me on Discord.