Still have not be able to find anything beyond the small original list of serial numbers. These receivers start around the late 30K to the early 40K serial number range, all are revision 1 and REP heat lot. Most of these receivers have had the guide ribs modified during rebuild but there are still some low ribs around. These should not be confused with the single narrow rib
found on some revision 2 receivers.
If you have a receiver with the extra wide guide rib could you post a photo ?
found on some revision 2 receivers.
If you have a receiver with the extra wide guide rib could you post a photo ?

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