Abstract: Implementations of a firearm sound suppressor are provided. The firearm sound suppressor comprises a non-cylindrical, monolithic baffle core that is enclosed by a front plate and a back plate. In some implementations, the baffle core may comprise a proximal end configured to mount onto the muzzle of a firearm barrel, a distal end having an outlet aperture, and a plurality of baffles. The plurality of baffles may be positioned transverse to a projectile pathway extending through the sound suppressor and form expansion chambers therebetween. In this way, propellant gasses generated by the discharge of a firearm may be dispersed throughout the interior of the sound suppressor, and directed away from the projectile pathway extending therethrough, by the shearing effect of each baffle. The baffle core may further comprise two longitudinally extending expansion chambers, each of which may be in fluid communication with ports extending through an exterior sidewall of the baffle core.