Grand Theft Auto V's latest Doomsday Heist update is said to have contained references for Red Dead Redemption 2. The information was obtained through mining game files in GTA V's latest update by The Guru Team according to an article by Kotaku.
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The said reference points out to a description of a double-action revolver that can be unlocked by completing a specific mission in GTA. A chest and a note were also discovered together with some references to a company called Boles Overland Stagecoach Co, which can be seen in the previous trailers of Red Dead Redemption 2. The mission could be in a form of a scavenger hunt to find the gold plated revolver by taking photos of various locations, one of which is thought of to be a grave which is a reference to the first installment of Red Dead Redemption. There's no official announcement by Rockstar of the said information but The Guru Team has a very good reputation when it comes to bringing up unreleased GTA materials. Check out the Stay tuned for more gaming news and updates.
Source: Kotaku, Images From The Guru Team