Sorry, No SS BAS for Axis. But here’s a complete Stainless Bolt Assembly with one. Always good to have spare part!
https://www.ebay.com/itm/13482791185...Bk9SR66TwoiDYw

And Gun Shack has the black Axis BAS. You could always just sand blast it silver & Polish with wax so it won’t rust.
https://www.gunshack.com/savage-parts?product_id=2893