  Magnetism of the binary intermetallic compound MnGa$_4$ is re-investigated.
Band-structure calculations predict antiferromagnetic behavior in contrast to
Pauli paramagnetism reported previously. Magnetic susceptibility measurements
on single crystals indeed reveal an antiferromagnetic transition at $T_N=393$
K. Neutron powder diffraction and $^{69,71}$Ga nuclear quadrupole resonance
spectroscopy show collinear antiferromagnetic order with magnetic moments
alligned along the [111] direction of the cubic unit cell. The magnetic moment
of 0.80(3)$\mu_B$ at 1.5 K extracted from the neutron data is in good agreement
with the band-structure results.
