Would be a handy little youth hunting rifle! I was literally looking online last night at getting a Ruger American Gen 2 like this to SBR at 8-9”. Do you still have the Ruger original stock?
I’m not aware of any company offering pre-built rifles in .458 socom. I used a Tromix barrel and a Remington action to build my own. Works great for having lots of energy behind a very quiet suppressed round.
Reach out if you need more info.