M1 Garand help!

I’ve posted this on some Facebook groups, but nothing 100% yet. Looks like a pretty obvious fakery. I’m just trying to see if anyone has any info on what is going on with these markings. For example, there is 11-SA-8 under the rear handguard. Can’t make sense of that. There’s a 30-06 stamp that I don’t recognize. Is this a criterion barrel? Maybe citadel? There are no import marks. Just trying to figure out something more than just “it doesn’t look right”.

thanks!