This is the 30 cal. gas operated Bible & my only go to when I did not have access to my Military teachers.
This Manual will take you through repair right up to building a M21 Sniper rifle.
A word of caution: Working on any firearm should only be undertaken by a trained person with a solid
mechanical background.
We took our triggers down to 4 lbs. & polished many other players in the trigger group. Expecting an over all improvement in accuracy will only be possible with all the NM improvements that Jerry shows in his book. Our rifles with scope attached would shoot Sub MOA or not be issued to our team members. Other than the Reciever & Barrel all parts were M14 NM US GI.
My advice would be to find a AMTU builder who is still accepting work on M1 Garands & M14/M21 rifles. Many like myself
are just not in the game any longer, but we were the Mechanics of the 30 cal. gas operated Service rifles. Todays ARs & M16
rifles are a matter of changing parts to improve accuracy & do not require the building techniques that took so many hours
of metal modification & polishing.
Any work on the triggers of the Garand & M14 should be done with great care as it can defeat the built in safety of these
great US Military Rifles. Good luck with your quest, I would still recommend getting Jerry's book as it will help you understand the Genius behind John Garand & his Firearms.
The U.S. .30 Cal. Gas Operated Service Rifles: A Shop Manual
http://www.gunbooks.com/us30.html