Whenever you have an antique, the value is determined by the condition of the Item. If I asked you "How much is my 57 chevy worth?" You would ask "What condition is it in." It's the same with air guns / rifles.
You need to provide more information. Give it some sort of rating like. POOR, FAIR, GOOD, VERY GOOD, or EXCELLENT. this will help me set an estimated value.
Your asking about a BB gun. Are you sure it's not a rifle. As far as I know King never made a BB gun only rifles. Be as clear with your question as possible and I will try to answer you. In fact, which model are you asking about. King made several different models.
It is 4 and the value is 3000.00
What kind of shot gun?
you kill old king cole in the castle with the spud gun
Gun shop, gun show, on line auctions
pump gun how old is it
Depends on the age, caliber, and markings. Value could be anywhere from literally nothing to hundreds of dollars.
You can find out how old your shotgun is, by going to the FN website and sending an e-mail to the commercial manufacturing division. Value is decided by condition, markings, and history of the gun.
Try the blue book of firearms value or call browning
Blue Book of Gun Values
50-100 or so
It all depends on if it was an original or reproduction gun. How old is it, who made it, what condition is it in? All these are factors in determining its value. Without this information it's value cannot be determined.
Look up "Blue book of airguns 8 edition."