Update on Mossberg 500: Got some SeaFoam Deep Creep and sprayed everything down. The guy that owns the gun doesn't want to go to trouble/expense of immersing whole receiver in penetrating oil. Going to spray with Deep Creep for a few days and then fire a few rounds through the gun. If that doesn't unstick the barrel, he'll just live with it. Anyway, all the other parts have been cleaned/oiled and are ready for reassembly.
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