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I have the Smith & Wesson 442 airweight. I have never tried to engage the lock. I have fired hundreds of rounds through it and it has never failed to fire. It has been a couple three maybe four years since I bought it but it had a somewhat heavy trigger pull. Especially for such a small revolver. I purchased and installed a new spring kit and the pull is much better than factory. It was a very noticeable difference. I have memory failure on occasion but I think the kit had a new rebound spring and a new main spring.