I'm sure it's probably just me, but the more I've listened to Monsters, the more I keep hearing parralels to Bring It Back Home instrumentally.
Logically I know the song was written by nuGuns, and they likely weren't drawing inspiration from old, unreleased classic Guns demos; but I can't help but hear how similar of a groove it has to me. Then again, who's to say how the song sounded prior to Slash & Duff re-recording it.