Skunkabilly: Check out the Fulton- Armory website. Everything that you could ever want to know about the M1A/M14 can be found there (or a link to it). You can also buy the Scott Duff M14 book there which is probably the best reference source on the subject.
http://www.fulton-armory.com/
Click on M14/M1A (left side) - then see FAQ's at the top/center of the page.