I recently bought a P93DAO slide & barrel (always figured it's good to have spare parts ;>) - when they arrived in the mail, I was surprised to discover that the barrel was black (rather than plain stainless), outside and inside, except for the feed ramp. The slide apparently has the same, satin black finish. I brought the parts into a friend's gun shop, and he & his smith suggested that the finish "looks factory," but weren't quite sure what it is. I've owned multiple P-series handguns, in different calibers, and have never seen one with a black barrel. I've tried repeated searches on the internet, and this forum, and have turned up references to a blackened stainless finish on some of the SR-series handguns, but no references to blackened stainless being a factory finish on any of the P-series guns. Anyone know if that was a factory option at some point, or maybe done for a specific law enforcement contract? Or is it after-market? Just wondering what it is - thanks for any help!!