are used to reduce the caliber of the weapon in use or to be able to use a different caliber in order to take advantage of a different range. They are different from conversions because reducers, being accessories, do not require an actual replacement of the other components of the weapon. These are not interchangeable rods as often thought, but are accessories. For this reason, they are sold freely and do not have to undergo examination by the National Proof House for weapons.