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DREBS, you came to the right place, but I don't think I will be able to help you. The marking looks to be etched vs stamped. SA could stand for semi-automatic. other clues that might help,
  • does the barrel have an 11-deg crown?
  • how many groves are there in the rifling?
  • what length gas does it have?
  • any other markings on the barrel?
 
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