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If this were my slide I would spend about 1 hour with a file and draw file the markss out then polish with sandpaper . The price of a good file and your job is done. Take your time and it will turn out 100%.
Do a search there have been a couple of gunnutz who have done it to Norinco 1911's and it turned out quite nice.IIRC it was posted in the pistol forum.