NO! NO! NO!!!! Do not nitre blue anything that is tempered or is a load bearing element!That’s a mighty fine looking blue on that Remington!
Have you ever tried a Nitre blue with that setup? A cylinder and screws in Nitre blue would be beautiful contrasting against the dark frame and barrel.
Great work!
Nitre bluing requires something like 750 degrees to do right. That will destroy a cylinder or frame.
New guns that are "Nitre Blued" or "Charcoal Blued" are no better than the "Color Case Hardening" that is done these days. It is in name only. It is cosmetic only!
I cringe when I see some well-meaning poster demonstrating how to "heat blue" a gun part buy lightin' 'er up with the torch, and maybe dropping it in oil. Do not do that either.
Screws are fine I suppose, but I would rust blue or hot oxide blue only, and rust blue is too much work!