The box lists it as blued, but it looks like a dull black, is it paint or bluing, and how durable is it? thanks
My 340PD has a similar looking frame finish, I believe it's called ion bond. It starts out as a matte black but my backstrap and other areas that get rubbed a lot have become a very nice semi-gloss black.
It is FAR more durable than the anodizing on my older Airweights.