A suppressor for a firearm comprises an inner chamber through which a projectile fired by the firearm passes along a projectile pathway through the suppressor. The suppressor further comprises a first baffle, a plurality of apertures at an outer perimeter of the first baffle, and a plurality of inner baffles spaced apart along the length of the inner chamber between the first baffle and an exit end of the suppressor. The side wall of the first baffle is configured to direct a flow of gases received from the firearm through the plurality of apertures at the outer perimeter of the first baffle, and the side wall of each inner baffle is an asymmetric side wall.