The 0000 is the Repro. Austin, did you measure a true 0000 frame Repro? I once did but have misplaced my notes. Your chart shows a dimension for the 000 frame that does not agree with TPS, page 527. The Parker Brothers .410 was almost always built on a 000 frame. As I understand it, all 0000 frames were made in Japan. 00 frame .410 Repro barrels are usually marked 0000, but it is not a true 0000 frame. They are mismarked barrels installed on 00 frame 28 gauge receivers.
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