dfaris is spot on the money regarding that factory preservative they use. That gunk is nasty and when heated up becomes even worse. Like baked on oven grease. On a new 870 spend some time with solvent and brushes and get all that stuff off. Then oil it well and keep it oiled. Keep the chamber clean. Use cheap ammo and you may have problems but it's probably not the gun. Some of the ammo they're making now is just awful.
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