FIREARM SUPPRESSOR END CAP

A suppressor having a front cap assembly comprising outer cap and inner cap elements that are matable and rotationally engaged, with a first condition having a first gas flow characteristic between the chamber and the exterior and a second condition having a first gas flow characteristic between the chamber and the exterior. The outer cap element defines a first gas bypass aperture, and the inner cap element defines a second gas bypass aperture, angularly offset from each other by a rotational offset increment. The gas bypass apertures may be registered or not registered depending on the condition. The outer cap defines an eccentric aperture, and the inner cap defines a protrusion, which may be polygonal and has a plurality of opposed parallel faces to include tool-engagement surfaces, defining a bullet bore, and configured to be closely received in the eccentric aperture for rotational engagement.