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There were a few receivers from the 37K serial number range to the 43K serial number range
with an extra wide guide rib. To date there are about a dozen known examples and most of
them have had the 7th round correction. As to the reason for this variation, it is not known
but suspect it would relate to the seventh round problem.
Both a normal receiver sn 41159 and an extra wide rib receiver sn 42593 are shown together,
both are original receivers without any modification to the guidedscn0722_0017.jpgdscn0721_0018.jpgdscn0712_0024.jpgdscn0724_0016.jpg ribs
with an extra wide guide rib. To date there are about a dozen known examples and most of
them have had the 7th round correction. As to the reason for this variation, it is not known
but suspect it would relate to the seventh round problem.
Both a normal receiver sn 41159 and an extra wide rib receiver sn 42593 are shown together,
both are original receivers without any modification to the guidedscn0722_0017.jpgdscn0721_0018.jpgdscn0712_0024.jpgdscn0724_0016.jpg ribs
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