My Garand is a 'plan B' option rifle.
In respect to the OP rod I have used the Garand Gear gas plug for maybe ten years.
http://www.garandgear.com/ported-gas-plug.htmlThis allows me to use normal commercial hunting cartridges with 180 grain bullets.
Mine is a CMP HRA, (2011?) looks new and shoots very well.
Good hunting.