H&M Blacknitride+™ process, or Ferritic Nitrocarburizing is used on KKM barrels and others, but is only available in the US. Not sure if anyone here is doing it in Canada.
I think there was a vendor on CGN a while ago that offered Diamond-like carbon (DLC) treatment but not sure if they did it themselves or shopped it out.
I checked out Cerakote but I think it will wear out on contact points fairly quickly.



























