Depends on what choke it has.
yes
This should be a Mossberg 500 in a Montgomery Wards suit. Check any dealer for the availability of a slug barrel.
Yes, but, DON'T DO IT!!!!!!!!
Yes, but, it is an exercise without a point.
A properly loaded shotgun shell slug load, yes.
No
At this time no,there are not any available.You could have a model 1300 slug barrel redone and have the gas ports added to this barrel.Then it will work fine in your model 1400 Winchester shotgun.
"Cylinder" is the safest choice, no question. "Improved Cylinder" is just big enough to allow the slug through, but the slight restriction might produce enough overpressure to cause cycling trouble.
As long as the slug barrel is smooth bored(does not have rifling) then it can be used with bird shot.
Yes.
no
I have one that I would sell.