Nice looking Garand!
I have to bump mine into battery every now and then.
Take a look at Tom's 1/3 Mix*, I have used it on my Garand and an SKS my Dad brought back from Viet Nam:
http://www.thegunstockdoctor.com/
*use it in a well ventilated area
If you want to shoot commercially available ammo, take a look at the ported gas plug from GarandGear. It's not legal for matches though...
http://www.garandgear.com/m1garand/d...-plug?sef=hcfp