if you polish it, youll lose the plating that prevents rust, and yeah you could duracoat over it, but then why spend the extra money on the plating to begin with? just buy a regular one
in my opinion its the best pump shotgun out there. ive put thousands of rounds through mine, and its like butter, plus its accurate (sorry joh for letting you certify with it and it not being sited in) as hell with slugs now. and ghost ring sites are badass on a shotty