Designed in 1985 and produced from 1986 to replace the Ruger Six line, the Ruger GP100 from Sturm, Ruger & Co. is a solid frame, six or seven-shot double action revolver. Intended to shoot an unlimited number of .357 magnum rounds the Ruger GP100 was made stronger than other revolvers at that time and more so then previous Ruger models, while retaining the normal Ruger style of Stainless or Blued steel and heavy frame.