On the Colt Fitz guns, here's some additional info: The Detective Special first became popular [in 1926] after J. H. FitzGerald, a Colt shooter, began to cut the Police Positive guns down to two inches for use as belly guns. In fact, FitzGerald went even further and bobbed the hammerspurs and cut out the front of the trigger guards in an attempt to make a real speed gun. They called them FitzGerald Specials, and many savvy gunmen preferred them for fighting guns.