Interesting. I bought a BNIB Mossberg from a sponsoring vendor. Inside the barrel and mag tube was a bunch of stuff that looked like rust. Turned out was some kind of nasty goop from the manufacturing process. Cleaned up with a little Hoppes and some patches.
If it truly is rust, i'd be firing off an e-mail to Mossberg with some pictures.
If it truly is rust, i'd be firing off an e-mail to Mossberg with some pictures.


















































