You need to complete certain challenging missions and side quests. Sometimes, it's hidden in specific locations or can be obtained as a reward for achieving high honor levels.
Yes, indeed. In Red Dead Redemption 2's story mode, there are gunsmiths available. You can take your Navy Revolver to these gunsmiths. They can upgrade aspects like the barrel for better accuracy, the grip for improved handling, and the sights for enhanced aiming. Upgrading your Navy Revolver can give you an edge in combat situations, whether you're facing off against other outlaws or law enforcement.
One interesting RDR 2 Micah Bell fan fiction could be about his backstory before joining the gang. Maybe it delves into his early life of crime and how he became the devious character we see in the game.
Yes, you can get the Navy Revolver in Red Dead Redemption 2's story mode. But it might require completing certain missions or meeting specific conditions.
You can start by looking on fan - fiction websites such as Archive of Our Own (AO3). There are often a large number of fan fictions dedicated to various aspects of RDR 2, including those centered around Micah Bell.