Halcón ML-57The ML-57 is a submachine gun manufactured by the Buenos Aires-based Halcon corporation.OverviewThe weapon is chambered in 9mm Parabellum for the Argentine Army and in.45 ACP for Police Forces, fed from 30-round magazines.VariantsML-60A later variant of the ML-57 was the ML-60 which housed a two trigger group which enabled select fire capabilities.