Well, after a long time searching, I finally found my hen's tooth. A long time ago, shortly after joining the forums, I began searching for a parkerized 18.5" barrel for my 500. My 500 is unique in that it was a bundle that came with parkerized barrels and mag tube. I looked all over for a parked 18.5" barrel. eBay rarely had any. I bid on one, but got bid sniped at the end. I was so mad. I was frustrated, and likened trying to find a parkerized 18.5" barrel to trying to find hen's teeth. I think I even mentioned it in an old post here. I even called Mossberg and the lady that answered the phone said they don't make any parkerized 18.5" barrels. When I gave her my serial number, and told her about the ones I saw on eBay, she said that they do make parkerized 18.5" barrels every so often for specialized store packages. A week ago I came across an eBay Buy It Now auction for a parkerized 18.5" barrel. The seller had nine of them, so I grabbed one. I couldn't believe I finally grabbed one! It was advertised as NOS, so I thought that was even better. It came yesterday and I was a little surprised. It came in a plastic bag wrapped in brown paper. The plastic bag had a sticker on it with some packaging info. The info looked like it had a date of 05/07. I think it also might have been a police barrel or something, because the label also had a cage number. I have no idea what a cage number is, but it grabbed my attention. Anywho, back to why I was surprised. I understand that the barrel had been sitting awhile. It had some light rust all over it. I always thought parkerization was supposed to be more rust resistant than standard bluing. It also looked dried out. I sprayed it liberally with Rem Oil, and that did a really good job of cleaning most of it up. However, it didn't clean up the rust around the lug for the barrel nut. This is my question, is there anything I can do to clean it up? I haven't been able to clean it with what I have so far. Here's a couple pictures. I know it's nothing special, and it looks like what I posted before, but now everything matches. I also threw my heatshield back on because I wanted to see what it looked like now that it all matches. I'm happy to say the search is finally over. I wanted to get some pics outside, but it's currently raining. We desperately need the rain, so I'm not minding it. The rust on the post isn't really noticeable unless real bright light is on it. It's just if I can do anything to remove it I'd like to. It's like that on all sides of the post.