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I know 2 people that had the lock engage while shooting. A 329 pd and a 638 airweight. The one with the 329 used locktight to render the lock inoperable, the airweight had a lock delete kit put in it. I have shot the airweight and it needed a trigger job but wasn't to bad. Hope this helps. The lock revolvers do have mim parts in them, but so does most new firearms on the market.