Here's the Army Manual for free courtesy of AR15.com: [url=http://www.ar15.com/content/books/TM9-1005-319-23.pdf]TM9-1005-319-23[/url]
Its a PDF file that is very large-- not for the slow internet connections folks.
BTW I do all of my maintenance and AR work based on the USMC manual, and it is just fine, and will do what you need.
Cheers, Otto