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This is somewhat of an edge case since the mags are relatively rare... But if you have a worn out bolt catch spring and you try running the OEM 20 rounders, you may find that the bolt carrier gets locked back when feeding the last round, causing a jam.
The 20 rounders use the same spring as the 30 rounders, which means you have a higher than normal spring preload on the last round. Combine that with a weak bolt catch spring and you run into this issue.
