Very common from the 1960s forward- right from the box. From time to time, Colt has solicited high skill custom gunsmiths to provide input about their revolver line. One such advised them to dump it. The Double action dates from the late 1880s and is problem-ridden. When pythons were popular, the more honest gun scribes would advise that the hand could be peened/streched one time before it had to be replaced- then a skilled gunsmith , and not just a schizoid nut with wierd theories, would have to fit a new hand and go throught the entire action to get it properly timed. Trinidad trained gunsmiths(or at least one that worked here) were told that colt actions had to be retimed every 7500 cycles regardless of ammunition used. That seemed very ambitious at the time.but you are right that some didn't, especially later production.(carry up)