Abstract: A corrosion inhibiting device for firearms which can fit into the chamber of a firearm or stand on its end is provided. The Device has three main sections. The first section is an inner sleeve having a base which approximates the size of the rim of the shell or cartridge of a particular firearm. Extending upwardly from the rim are a plurality of arms which are circumferentially curved to approximate the shape of a firearm chamber. In between each arm is a space through which a volatile corrosion inhibitor material vapor is expelled. The second section of the Device is an outer sleeve. The outer sleeve is columnar in shape and sized so that it approximates the circumference of the shell or cartridge of a particular firearm. One end is open and fits over the upwardly extending arms of the inner sleeve, and is held in place by an O-ring found near the base of the inner sleeve. The opposite end of the outer sleeve is covered, with the exception that it has a hole formed into it.