Despite all of their time apart, Duff McKagan isn't ruling out a long-hoped-for reunion of the classic-era lineup of Guns N' Roses.

"It could happen," McKagan told WIND-FM. "I mean, this thing could happen, and it could not. And I think it would be wonderful, one day, if we reconciled, first and foremost. That alone would be cool."

McKagan hadn't shared a stage with Axl Rose for 17 years until they played together at a London concert in 2010. That show apparently opened the floodgates. There have been other semi-reunions in 2011, during shows in Vancouver and Seattle, and then at five concerts in 2014. He filled in for Tommy Stinson, when the current Guns N' Roses bassist was off playing with the Replacements at Coachella.

Asked why he felt the original group split, McKagan said "it was a lot of things. We just got really big. ... Once we started getting big, we got really big really fast. And there's no 'how-to' instructional manual for that thing, what happens to your life. We'd just fall into every kind of stupid typical thing that we thought we'd never fall into."

McKagan has just released his second book, How to Be a Man (And Other Illusions), as well as a three-song EP, also called How to Be a Man. This is his second book, following the bestselling memoir It's So Easy (And Other Lies).

His former GNR bandmate Slash also left the door open for a reunion with Rose earlier this month.

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