You apparently know a good revolver check out, push off, endshake, etc. I would pay particular attention to timing, even if it is a fairly new condition gun. As you may know, in double action pull, unlike a Smith, the cylinder bolt doesn't drop onto the cylinder until the cylinder is already in the "lead-in" notch approaching the slot and then drops into the slot just as the hammer falls. This is normal for a Colt and is not indicative of a timing problem.
Good luck with your persuits.
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Dick
The watchwords for all mankind are.....Liberty and Freedom.