Chuck up a fairly soft wire brush in your drill. Put on your safety goggles and brush off the old finish. Though I haven't stripped a Mossberg finish I'm thinking a stainless steel chore boy scrubber should also work if done by hand. I have used the core boy pot scrubbers with oil on different guns many times. The brushed finish is not as bright as a polished finish. Aluminum wont rust and is fairly corrosion resistant. wipe it down with gun oil and call it good. I've done the receiver, barrel band and butt plate on a Ruger 10/22 and I really like the finish a lot. here's a pic. The barrel was done with a Hoppes gun blue kit which is a rust blue process and still looks good a decade later.
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