This report, SMALL ARMS WEAPON SYSTEMS (SAWS) FIELD EXPERIMENT (CDCEC 65-4), 10 May 1966,
to be found at
http://www.dtic.mil/cgi-bin/GetTRDoc...f&AD=AD0488337 ,
if you get into section C, you will find data on parts attrition for M14’s, M16’s, Stoner weapons, and AK47’s.