This is a really old piece (comparatively speaking for street/graffiti art in the Bearpit) that has been in my ready to publish folder for ages. It is by DNT and I think situated in the north tunnel, the one that heads off towards Stokes Croft. You can tell it is an old piece from the absence of tagging around the framed area.
It is a slightly strange and somewhat threatening piece, although I’m not sure it is meant to be. I don’t know what the M.B.G stands for, but maybe there is someone out there who can enlighten me.