The Marlin X guns morphed into the Remington 783s and AFAIK Remington hasn't cataloged the 783s in stainless.

I have yet to see a poor shooting Marlin X gun. I've got a dozen of them, mostly rebarreled with recycled Savage 110 series barrels, and have shot at least a dozen more. I think that Remington should have just made the X guns in the same configuration that Marlin did, as the cosmetic changes to the 783s are a negative for me.