If you consider that a new Model 1100 is around $1,100, then you could have choke tubes installed and refinish the gun and still spend only a fraction of the cost of a new gun. On the other hand, if you just want a dove shooting beater, you might get a brake cylinder hone and open your choke a little.
We can only suggest what we might do if in your shoes. You need to evaluate your budget, get some accurate costs on proposed changes and make a decision. You really don't need to do anything, as my friend, olddrum, said, "…leave it as is. It should make a pretty good dove gun…"