Rust

[u/Diligent_Studio6763]

Hey all!

I recently purchased a Benelli M4. I’ve had it out twice now and put maybe 250 rounds of buckshot and slugs through it as well as some target loads. I oiled it before I put it together the first time. When taking it apart now to re apply some oil, I noticed this rust here. I was just wondering if this is a problem and something can be done about it or if this is something that just happens. I am rather new to the hobby so any and all advice would be greatly appreciated.

[u/MasterofAxe]

I wonder if you store it in the case all the time with sponge in it because sponge absorb moisture all the time. Either leave it in a safe or add some desiccant to the case will do.