If you don't have the 'center pin key', I guess you'll have to peen the two ends of the axle so it doesn't come out, but is still flat enough for the toggle to close. Or other options, such as modifying the pin to a screw fit or other mod. As a side note, the Stoner LMG had faulty locking pins with a screw design holding the grip to the frame in the earlier versions, and they fell out and killed some SEALs. After that it was modified with a snap in pin that precluded it from falling out. Locking pins are a simple concept, but faulty ones can ruin your day.
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