You can "fix" it one of two ways. One, mill the slot in the bolt head shaft or two, cut, grind, file or Dremel the key out of the bolt body.
Another thing you may want to check is the firing pin diameters since your bolt has the keyed bolt head. The old pins were .145", the newer ones, .095", the portion of the pin forward the adjustment nut. If your's is the old .145, you'll most likely need to drill out the bolt head to the vent using a #26 ( .147") bit.
Bill
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