The only disadvantage to an older Wingmaster is that they don't have the flex tab feature, that's on all the new 870's.
Now, before anyone raises the panic flag, I have 30+ year old Wingmaster that doesn't have it and I'm not terribly inclined to call it a lesser gun. Just a thought for those who consider it important.
"Of every 100 men that go to battle 70 should not even be there, 20 are nothing but targets, 9 are true soldiers, and we are lucky to have them for they the battle make but ONE, one is a warrior, and HE will bring the others home." Hericlitus