If you have a small sample of the steel in question, a chemical analysis can be run on that sample, to determine the chemical composition - which will tell you the grade. Second, a microhardness test can be run to learn the base metal hardness, and the presence of any hard surface layer, such as nitriding.
For a $200 barrel of questionable material, I'd just stick a magnet to it and and call it good to go. After seeing the logo and reading about "Rearden Steel" it's pretty obvious they don't want you to know.
Mystery as a marketing campaign. Who wudda ever thunk it? I have no idea, maybe they do.
I hope it shoots clover leaf groups and I regret not getting one.
