Dana, to hot blue those pieces they need to be immersed in molten bluing salts at 300 degrees for 1/2 hour.
As well as the blades.
They are take-down.
Here are some parts from an old Bowie I did. Just happened to have these photos.
First one is the surgically clean parts, second is the parts suspended in molten caustic bluing salts for 1/2 hour, third is the finished parts and fourth is the tank I use for large Damascus blades: