In GTA Online, solving the mystery will also trigger the the Navy Revolver Challenge, which awards you with GTA$250,000 for getting 50 kills with the same weapon. Completing the challenge will.

A vicious serial killer is roaming the countryside, carrying out bloody murders with an antique Navy Revolver. Scour Blaine County for clues and bring this wicked killer to justice to claim their unique weapon for your own collection.

1. Dec 13, 2019 The Red Dead Online Navy Revolver can be bought from the gunsmith at a fairly high price, or earned for free if you complete a specific mission in GTA Online and have the two accounts connected. So, in our RDR2 Online How to Get Navy Revolver guide, we’re going to show you both methods of earning the new gun in Red Dead Online.
2. If your Navy Revolver shows up in your Gun Locker, it isn't glitched and it won't be removed by the Peyote Plant. If it is glitched, it will be removed, but you can still purchase it again in any Ammu-Nation. Once you've purchased it, you'll be able to hide it with your Gun Locker like the Double Action Revolver.

1851 Navy Revolver

Gta Online Navy Revolver Location

Completing the GTA Online mystery will earn you the Navy Revolver and unlock the Navy Revolver Challenge, complete the challenge by getting 50 kills of your own with the Revolver to earn GTA$250,000 and Social Club members will unlock the Lowery Revolver in Red Dead Online.

Gta Online Navy Revolver Challenge

You won’t be able to pick up this special Revolver from any underhanded Fence in Red Dead Online – this blood-stained variant can only be discovered. Search the towns of New Hanover, West Elizabeth and Lemoyne for clues to its location.

Army Revolver

Here's both the guides by our friends at GTASeriesVideos, on how to unlock the Navy Revolver in GTA Online and where to find the Lowry's Revolver in Red Dead Online.