Looking at the ratchet in that cylinder makes me think that gun has had some very hot loads fired through it. The hand turns the cylinder by rotating the ratchets and the timing is controlled by the workings of that process. If you could find a ratchet which the factory considers factory replacement only, you would have to file each for timing in conjunction with the hand. Send that thing back to the guys that made it and save yourself a lot of headache.
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