The Baker hammerless guns began with the A and B Grades. They were offered in 10-, 12- and 16-gauges. The R and S Grades appeared about 1905, offered in 12- and 16-gauges, and over the next five years supplanted the A and B Grades. By the 1909 The Baker Gunner the A-Grade was gone and the B-Grade was only offered in 10- and 12-gauges. By the 1911 catalog they are both gone.