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Polygonal HK?

Discussion in 'The Powder Keg' started by mack asenbach, Mar 20, 2002.

  1. Purchased an HK 91 late 70s early 80s and am unsure of how to tell if it has polygonal rifling in the barrel. Does any body happen to have the serial number ranges of the guns sent from HK with the polygonal rifling?? Would really appreciate them.