User blog comment:JackFrost23/WTF?! - A Guy With a Horse and a Gun in a Gang Match Waiting Room?!/@comment-5417211-20120426144731/@comment-1265875-20120426151721

No, it's actually a modified version of the game disc that allows single player cheats in multiplayer. Since there are several gun sets in the cheat menu, all the person has to do is hit start and select one of them. Voila, guns in a lobby...

A buddy of mine and I have been doing some detective work on cheating in Red Dead and have found this out.

Among other things...