.500 LINEBAUGh REVOLVER - As stated in the Wiki article, the vast majority of all .500 Linebaugh pistols are custom modifications. In this case a Ruger Redhawk is the host. The chamber is replaced from its original .44 Mag 5-shot to the .500 Linebaugh 5-shot. This requires a retiming of the cylinder as well as the reboring of the barrel. Hamilton Bowen work circa 2000. Early "full fist" non-rounded rear grip.