  Magnetism breaks the time reversal symmetry expected to open a Dirac gap in
3D topological insulators that consequently leads to quantum anomalous Hall
effect. The most common approach of inducing ferromagnetic state is by doping
magnetic 3$d$ elements into bulk of 3D topological insulators. In
Cr$_{0.15}$(Bi$_{0.1}$Sb$_{0.9}$)$_{1.85}$Te$_3$, the material where the
quantum anomalous Hall effect was initially discovered at temperatures much
lower than the ferromagnetic transition, $T_C$, the scanning tunneling
microscopy studies have reported a large Dirac gap $\sim20-100$ meV. The
discrepancy between the low temperature of quantum anomalous Hall effect ($\ll
T_C$) and large spectroscopic Dirac gaps ($\gg T_C$) found in magnetic
topological insulators remains puzzling. Here, we used angle-resolved
photoemission spectroscopy to study the surface electronic structure of
pristine and potassium doped surface of
Cr$_{0.15}$(Bi$_{0.1}$Sb$_{0.9}$)$_{1.85}$Te$_3$. Upon potassium deposition,
the $p$-type surface state of pristine sample was turned into an $n$-type,
allowing spectroscopic observation of Dirac point. We find a gapless surface
state, with no evidence of a large Dirac gap reported in tunneling studies.
