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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Hey, thanks for the info. I recently bought a python at a gunshow (my first hand gun)and the timing is exactly as you described. I was pretty sure it was normal but makes me feel better to here someone else say it.
Good luck in your search for a python, I've only had time to make it to the range once since getting mine, but was really in awe of it.