A suppressor for a multi-barrel weapon system includes an adapter baffle configured to engage the weapon system and receive the muzzles of the barrels, a plurality of extension baffles configured to be aligned with and arranged in a stack on the adaptor baffle, and an endcap baffle configured to align with the extension baffles and engage the final extension baffle in the stack. A plurality of projectile apertures in each baffle aligns with the muzzles to define a plurality of parallel bullet paths. Each projectile aperture can be in fluid communication with each other projectile aperture. Each extension baffle can include a plurality of internal vanes configured to circulate propellant gasses emitted from the muzzles of each barrel within an interior space at least partially defined by the extension baffle. The adapter baffle can define an expansion space in which propellant gases emitted from each muzzle comingle during discharge of the weapon system.