nitride metal treatment
fyi i just had my white .410 super 91 barreled action and all the metal parts treated and man they really look great anybody else have theres done. haven't shot it or been in the field yet so not sure how durable it is but the guy's that did it say's it's super tough ! it was a little pricey at 250 bucks but that's for everything including scope bases and every metal part and all the screws.