Got it back on Friday. Armorer at the store said when he called them to send it in they asked about it, he explained it, they diagnosed it as end shake, and sent him shims for the cylinder. This sound correct?

At any rate while dry firing it the thing works perfectly now without even a hint of the catch in the action like before. He said if it did it again to bring it back in to them.

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Caretaker of a small herd.