Getting more and more common. I think they make great mounters. Here's a little more info about them.
This melanistic mutant is a pure breed. These large, beautiful pheasants feature an iridescent, greenish-black plumage. A favorite variety for release, they display a remarkable ability to survive and reproduce in the wild. Prime habitat consists of 55-70 % crop fields such as corn, soybean, or small grains. The remainder of the habitat should include some wetlands, grassland, and woodland or brushy thickets.
Some have white rings on the neck, some do not. Here's one with a little ring.