What is the value model 312 pellet gum with brass barrel?

Answer 1

I'm going to try to answer your question, but first I need to clarify something:

You do mean Pellet gun not Pellet gum. You did not state the manufactures name so I think you mean "Benjamin 312 Pellet rifle."

Now all you need to do is verify you meant "Benjamin 312 pellet rifle" and let me know the current condition of this rifle. Also state if it still holds air and is working condition.

Then I can give you and estimate of value