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AR15.COM
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12/29/2014 12:11:43 PM EDT
Hi All,

Yesterday I was doing standard maintenance on my guns (inspection, wipe down, etc)  As I was finishing, I noticed an orangeish brown compound on the rail of my Mossberg 500.  I was a little confused, as I always wipe my stuff down, keep it at a regulated 72 degrees and 27% humidity.  I took a couple of pictures, one showing the substance, and the other after I used Ballistol and a nylon brush.  It was not nearly as visible to the naked eye, as it is in the photo... i think the flash really captured it.  Can you assist in whether you think it's rust, or a grease of some kind?  Would rust have cleaned off as well as the 2nd picture shows?  How do I know if it's rust or grease?

https://www.flickr.com/photos/54136952@N02/16107041186/

https://www.flickr.com/photos/54136952@N02/15947811947/
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