Once you learn to field strip it, you can explore whether the hold-open is intact but thwarted by accumulated goo, or damaged. It needs to move freely. I would suggest trying a different mag in the meantime. An FXO mag would not normally be suspected of having a weak spring, which could be the culprit, but one never knows...
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"... Liberty is the seed and soil, the air and light, the dew and rain of progress, love and joy."-- Robert Greene Ingersoll 1894
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