Corrosion Resistance Question

So I'm looking at getting a 556 right now and have been trying to find something that can handle extremely salty conditions. I basically live in salt water and my current boat gun is a cheap 410. I've been trying to combat rust with it for a while now but even with me completely tearing it apart and cleaning it every time I go out on the boat it is still starting to surface rust in some places. Is aluminum the best bet. I've found an all aluminum pistol that I was thinking about getting but have been also looking at getting me a rifle. Are there all aluminum rifles that aren't 22. I saw some carbon fiber stuff but that's out of my price range.

submitted by /u/AdWrong3461
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