Footnote F

Footnote F       Remington 870 break down and reassembly for cleaning.

www.learnaboutguns.com/2008/05/07/how-to-disassemble-clean-and-reassemble-a-remington-870/

After each use, I routinely squirt some Rem-oil into the barrel and run a few rags through it in the direction of the action, to clean out powder residue and such.  I follow that with a swap and some Rem-oil on it.  Then I sort of squirt some into the action and work it a couple times, wiping it out. Then a little "zot" into the trigger area to keep moisture out.  Then I wipe down the metal and case it.

But there has to be an occasional breakdown and cleaning of the internal parts or residues and crud will find a way to build up, gather moisture, and start pitting stuff.  This is a good little article on breaking it down to lubricate and clean the hidden, internal parts once in a while.  What a great thing, the internet, to be able to download such stuff at a moment's notice, even with regards to older, rarer guns.