  Very recently, it has been shown by other authors that the CDF measurement of
the top quark forward-backward asymmetry can be explained by means of a heavy
and broad axigluon. In order to work, this mechanism needs that the axigluon
coupling to the top quark must be different than the coupling to light quarks
and both must be stronger than the one predicted in classical axigluon models.
In this paper, we argue that this kind of axigluon can be accommodated in an
extended chiral color model we proposed previously. Additionally, we show that
the desired features can be derived from a simple four-site model with
delocalized fermions.
