An apparatus is provided for a firearm suppressor. The apparatus includes an outer tube defining a longitudinal axis, and an inner cylinder defining an inner chamber. The inner cylinder is disposed at least partially within the outer tube and defines an outer chamber with the outer tube, where the outer chamber is disposed between an inner surface of the outer tube and an outer surface of the inner cylinder, and where the inner cylinder comprises at least one opening to fluidly couple the inner chamber with the outer chamber. The apparatus also includes at least one flow structure disposed in the outer chamber and positioned to direct firearm combustion gasses in a fluid pathway that is off-axis with respect to the longitudinal axis.