The best answer I can give is "probably not." A few months before Postal Inspectors rec'd their Speed Six's, a couple dozen Inspectors, including me, went to the Ruger factory for a week of amorer training. While at this training a Deputy Chief Inspector told us how this weapon was specially...
As a now-retired Postal Inspector who was a Division Firearms Coordinator for 14 yrs, I can hopefully clarify a few points.
In 1986, the U.S. Postal Inspection Service contracted with Ruger to build a stainless steel .357 magnum revolver with a 3 inch barrel exclusively for use by Postal...