Originally Posted by strosfann
What is the approximate cost for getting the black nitride finish on a barreled action?


I've never done a gun, but the guys in this link said $150 for a barreled action

https://www.24hourcampfire.com/ubbt...rue/re-h-m-nitriding-review#Post15859797

We've done it for industrial parts in a high wash down (caustics and acids weekly, humid environment daily) that we couldn't source in stainless. It has always held up well.