As some of you may know, in the past few days there was a treasure hunt found in the GTA Online files, where, if you completed it, you would earn a Double-Action Revolver in GTA Online, and after 50 headshots with it, you can unlock a variation of it in RDR2 as soon as the game is available and you log-in with your Social Club account.
Rockstar has released this today and it consists of a set of 4 clues you must find to get to the gun. There are 20 locations for clues and they're randomised for everyone. You start out by receiving an email from a van der Linde address with a picture for the next clue. The other three will be next. (Thanks to Borgeitor, we know that only the first clue with the letter and the last one with the gun seem to be randomised)
The game presents you with a "?" on the radar and a radius where to find the clues, and you'll be able to hear a dreamcatcher-like sound the closer you get to the clue. Once there, you can inspect the clue and hear a very satisfying RDR-like sound effect and go to the next clue.
The gun will be marked on the radar once you find all the clues, and it will be yours in GTA Online. Perform 50 headshots (both NPC's and players) to win a variation of it in RDR2.
The sound really is damned satisfying and definitely hypeworthy for RDR2.
Location of all the clues (these will be randomised)
Update: A little post update, and definitely speculation worthy... The clues we find begin from a letter saying the family was torn apart by the treasure, and end up with two dead bodies (with finding a naked body first, a shovel and the empty gun case) with guns by them, two hillbillies, which is where the gun is. I wonder to what extent this ties in with RDR2.
Credit: Edgar Draw