Others will chime in soon. My guess is the cartridge cutoff spring isn't working: this allows rotory mag to overfeed. Again a guess.
You said you had probs with military stuff. Have you ever fired it with other loads? If not, you had problems extracting-period. What brand of mil? Steel or brass cased? Does the extractor tip have a broken hook? (Damaged extractor: replace) Does the shell start to pull out, but then extractor pops off shell? (Probably spring issue on extractor: if there is a spring) Does extractor rip the rim off shell? (either brass/steel case issue, shell coating issue, rough chamber issue or oversized chamber?)
More info please. 99f? 99eg? 99c? Etc.?
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