seeing some post as to the Lightweights comes to mind we have come across a pair of 1958 "lightweights" that happen to be cousins, one a Colt and the other a Ruger LW SC, so both have the 'steel cylinders' and they came as a pair to us from the wife of a passed friend, sadly the girls threw out any and all the paper, carboard boxes and stuff, while cleaning up the house, hey at least they tried to help Mom..........