What gun used in World War I, World War II, Korean War and Vietnam War is Sig Sauer GSR ("Granite Series Rail") modeled after?
SIG Sauer 1911: The SIG Sauer GSR ("Granite Series Rail") is a series of pistols with a stainless steel frame and slide based on the M1911 by SIG Sauer. M1911 pistol:  It was widely used in World War I, World War II, the Korean War, and the Vietnam War.
M1911