Cartridge Case Liner

A cartridge case liner, also known as a chamber insert or chamber adapter, is a component used in firearms. It is a cylindrical sleeve made of materials such as steel or brass that is inserted into the chamber of a firearm.

The purpose of a cartridge case liner is to allow the use of smaller caliber ammunition in a firearm chambered for a larger caliber. This can be useful in situations where ammunition for a specific caliber is scarce or expensive, or when a shooter wants to practice with a lower-recoil or less expensive ammunition.

The cartridge case liner fits snugly into the chamber of the firearm, effectively reducing the chamber size to accommodate the smaller caliber cartridge. It typically has a rim or flange at the base to ensure proper alignment and extraction.

It is important to note that the use of cartridge case liners should be done with caution and only in firearms specifically designed for their use. It is recommended to consult with a knowledgeable gunsmith or firearm expert before using cartridge case liners to ensure safety and proper functioning of the firearm.