The cmp auction has another extra wide rib receiver. Not many of these are around and most have the low guide ribs welded-up for the seventh round correction. The cmp auction receiver is serial number 42427. Data on these extra wide rib receivers appears to start at 36733, there are about 10 or 12 known to date.
Photos show an original receiver still with the low guide rbs
Photos show an original receiver still with the low guide rbs
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