2015 will mark 27 years in business for Carlson's Choke Tubes. For the last 27 years, we have been able to grow and improve our line of choke tubes. This has come from patterning tens of thousands of shells and using all different makes and models of guns. By examining patterns and making adjustments to things such as the parallel section, finish, and diameters, we are able to provide an affordable product that performs... Period. We provide ourselves on our customer service and encourage customers to contact us anytime they have a concern or question. We back our product with a lifetime warranty! The 20ga. aluminum snap caps are made from high strength aluminum for repeat use. Spring-loaded primer plunger prevents firing pin damage during dry-firing exercises. NOTE: leaving guns cocked during storage is hard on springs and is dangerous. These will help keep your gun in good condition. Set of 2.