good writers don't always have good advice or recommendations.
My personal experience with rust in the tube was on an AR6 pistol. I don't know if the prior owner used a pump or not. The outside was clean and bluing was nice. But the inside of the tube was rust dusted, not yet pitted into the metal. I attributed it to a combination of moisture in the tube and the fact that the seals were blown. So tubes will definitely rust, and on guns that aren't more than about 10 years old.
I have the idea that the metal will rust faster if there is no pressure, and slower if the tube is pressurized. Don't remember where that idea came from. Hand pumps aren't generally pressurized, so I would expect moisture to rust the pump internals faster than the gun. Maybe you mettalurgists, chemists, or rust specialists can set me straight on the pressure aspect, if I'm incorrect. Or if someone has years of experience with pressure vessels, then input on rust and pressure would be appreciated.
I have a pump, but only use it to top off and even then only when I am running below pressure on my carbon fiber tanks. Maybe a couple times a year, and I tend to shoot that air out in short order.
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