That an interesting question because it has been discussed before. The late Billy Pyle told me that rifles that were out of specs were sent back to be re-worked, rifles that failed
function firing were also sent back to be re-worked, maybe (just guess) 10 % of each. This will increase the actual serial number range for the first 500 rifles
I am certain my 100931 is not among the E.O. group and I find it interesting that both Springfield and Winchester do not have an actual list of the 500 serial numbers that
has survived from such a historical event