I have located a Remington 870 that the seller says is a Wingmaster and is parkerized. Did Remington offer a shotgun back then that was factory parkerized? He says it's a police even though it says wingmaster only. Suppose to be never fired. Also I did a Internet search and came up with some info that says if it's parkerized it's an Express and not a wingmaster. I'm confused. I can post a pic later.