Dura-coat, Cera-coat, parkerizing, theres lots of options out there. You dont see many blued guns these days, i personally love blued guns.
All of the other finishes are much more durable and come in matte black.
“While I've often said I wanted to die in bed, what I meant is in my old age I wanted to be stepped on by an elephant while making love.”
― Roger Zelazny, The Great Book of Amber