These components are designed to be placed within a shotgun’s existing barrel, effectively changing its gauge or chambering. As an example, a user might employ such a device to convert a 12-gauge shotgun to fire smaller, less expensive 20-gauge ammunition, or even handgun cartridges like .45 Colt or 9mm, depending on the insert’s design. Functionally, the device provides a new bore within the original barrel, enabling the use of different ammunition types without permanent firearm modification.
The importance of these devices lies in their versatility, offering options for practicing with reduced recoil and ammunition costs or providing adaptability for hunting various game types. Historically, they have provided shooters with options for conservation, allowing the use of otherwise obsolete firearms with modern ammunition, or adapting to ammunition scarcity during times of shortage. The use of these devices offers a blend of economic and practical advantages.
