RIO, a familiar name since 1896, was introduced to US shooters in 2002. With the opening of its state-of-the-art production plant in Marshall, Texas, in 2015 RIO Ammunition is now focused on the production and development of cartridges for the American shooter. RIO Ammunition is the US subsidiary of MAXAM, the worldwide leader in the development, manufacturing, and marketing of sporting and hunting shotgun cartridges. RIO's success is based on proprietary technological developments and a totally integrated production chain ranging from the manufacture of the main raw materials to the production of all the cartridge components (cases, primers, powder, wads and shot).