Dean, actually, the 0000 mark on the lug would be there on 00 barrels as well as 0000 barrels. That's just the way the Repro factory marked them. So then it gets complicated. If I am right about the firing pin distance, the 0000 receiver would be different from the 28 gauge 00 receiver. My recollection is that the genuine 0000 receiver has the same pin separation as a factory Parker Brothers 000 .410 receiver. In addition to the different appearance of the breech balls, the pin separation is different on the Repro 00 and the Repro 0000 .410 guns. The pin separation on the 000, and supposedly the 0000, is 13/16". The separation on the 00 frame, whether original Parker Brothers or Repro 28 gauge or .410 on the 28 gauge frame, is 15/16". Now, I am working from memory from when I measured 0000 Repro pin separations that were in the possession of Geoffroy Gournet. Maybe the owner of a 0000 frame BHE or Gournet custom could confirm. I believe I also measured pin separations in 0000 frames when Kevin McCormack and I had a couple of 0000 frame Repros in our display at Baltimore a few years ago.
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