I watched the videos again, and here's my guess.
"You will hear one click when the cylinder is indexed, and another click after I wiggle the cylinder. After this second click, the cylinder always rotates on the first full. But before this second click, the cylinder will not rotate on first pull."
Click 1: I think the cylinder is NOT indexed after this click. See if the bolt jumps up and hits the cylinder (making the click) without entering the notch.
Click 2: That might be the bolt jumping into the cylinder notch to index the cylinder after you twist it a bit. This may be why the gun works after it is "really" indexed.
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