This link: http://www.second-amendment.org/misc/M14_RHAD.pdf has got excellent info. Would have liked to see info regarding what the best accuracy attained was with the M14NM's rebuilt by the US Army and Marine Corps shops when used with the best commercial match ammo or handloads with new commercial cases. Talking with their top competitors who won the matches and set the records, the best M14NM's would hold 4 inches all day long at 600 yards. Only the Garands converted to 7.62 NATO at the USN Small Arms Match Conditioning Unit equaled that for a semiauto rifle. I'm not aware of any other semiauto 30 caliber rifle doing that well.