Heard back from Barrel Exchange and he has done conversions to 54R for 1917A1s.
Discussion on http://1919a4.com/showthread.php?43380-Convertering-a-1917A1-to-shoot-other-calibers-%28i-e-7-62x54R-7-62-Nato-etc-%29
Discussion on http://1919a4.com/showthread.php?43380-Convertering-a-1917A1-to-shoot-other-calibers-%28i-e-7-62x54R-7-62-Nato-etc-%29
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