This is a rare version of Manchild with, unlike the album, KG singing the song instead of Mike Bray. It was released in 2013 at the NAMM Convention in LA as a promotional single before the release of the album itself. It was presented as a single with Bro Ho as the B-side, though it's the exact same version of Bro Ho as on the album, only Manchild is different.
Kyle Gass - vocals
Mike Bray - guitar (possibly, not 100% sure)
John Konesky - lead guitar
Jason Keene - bass
Nate Rothacker - drums