In 1981 my 4" S&W M-19 locked up on me, a small part had broken inside, and locked it up tight. A few years ago my Colt Mark IV locked back on me, after trying the usual solutions I disassembled it practically to the bare frame, found that enough residue had built up in the trigger area to cause the problem. Again, they are mechanical devices, they are human creations, they can fail.
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