rim lock https://firearmwiki.com/images/8/81/Rim-Lock-Rimlock-Diagram-Illustration-Malfunction-Firearm-Wiki.gif
rim lock https://firearmwiki.com/images/8/81/Rim-Lock-Rimlock-Diagram-Illustration-Malfunction-Firearm-Wiki.gif

Note the left column of rounds, with the top case being trapped behind the rim of the second. This causes rim lock.
Courtesy: https://firearmwiki.com/images/8/81/Rim-Lock-Rimlock-Diagram-Illustration-Malfunction-Firearm-Wiki.gif
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