Duswalt, who is making the media rounds to promote his new memoir, "Welcome to My Jungle," says that Duff McKagan could pave the way for the band reuniting. McKagan has recently rejoined the band live, filling in for Tommy Stinson who has had live commitments with The Replacements.

"Duff is paving the way to open the gates again," Duswalt said to ABC News Radio. "Axl and Duff are really getting along well at the concerts, so there's an opening."

However, Duswalt also admits that there is bad blood between Axl and Slash, but he and others that were associated with the band in the past feel that Duff could bring the former members together.

Duswalt tells ABC News Radio that he knows "for a fact [Axl and Slash] hate each other right now. It's bad. Axl is a loyal guy and you get on his bad side and some people don't come back, but Slash and him were so close. We [in the old-school Guns camp] all have a feeling it will happen. It's gonna happen in the next two years...there's an opening because of Duff playing with Axl."

He also went into some details about where the rift between Axl and Slash originated. "It was a thing that happened at the end of [Use Your Illusion]," he said. "There were also the differences in music," Duswalt adds, "like Slash wanted to do more hard rock stuff and Axl wanted to do more ballads, rock ballads. There was that difference, but there was a specific thing that happened that both of them are at odds over."