This device allows firearms chambered for larger shotgun shells, typically 12 gauge, to safely fire smaller gauge ammunition, such as .410 bore or 28 gauge. It functions by creating a smaller chamber within the larger bore, ensuring proper gas pressure and shot pattern. For instance, using a 12-gauge shotgun for various applications, from hunting different game to target shooting, becomes more versatile and economical with such an adaptation.
The ability to adapt a firearm to different ammunition types provides significant flexibility and cost savings. Hunters can utilize a single firearm for diverse game, while target shooters can select ammunition based on recoil preference and cost-effectiveness. Historically, dedicated firearms were required for each gauge, representing a significant investment. This technology simplifies logistics and reduces the financial burden associated with owning multiple firearms.