Plenty of info on Google on 'Diamond Like Carbon'. Diamonds are made of carbon of course, this coating is apparently a layer of carbon that is structurally 'diamond-like'. We've actually got a DLC coated stainless test piece in service at work to see how it resists erosion - I didn't know they were applying it to firearms. No real info yet on how it's holding up here (give it a few more months), but it's in test against tungsten carbide coated stainless, plasma-nitrided stainless, and uncoated hardened stainless as a control. If it's comparable or better than these other test pieces then it's pretty tough stuff.
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