2015 will mark 27 years in business for Carlson's choke tubes. For the last 27 years, Carlsonshave been able to grow and improve their line of choke tubes. This has come from patterning tens of thousands of shells and using all different makes and models of shotguns. By examining patterns and making adjustments to things such as the parallel section, finish, and diameters, theyare able to provide an affordable product that performs... period. The 25 06 Rim fire snap cap allows for safe release of firing pin springs. A spring loaded striking area cushions and protects firing pins. This snap cap is an excellent tool for teaching and eliminating flinching.