Don't forget the TE rebuilds, they are featured in the Spring 2016 GCAJournal. The author was able to find the guy who was in charge 1968-1970 and ran the M1D build program. About 30 years ago I bought a perfect 1965 SA rebuild with DCM papers as an example of what happened to most M1s, I love that rifle. In those days, most collectors ignored rebuilds.