You need to seek the services of a profesional firearms trainer.
18 but if you are under 18 but over 12 you can have a minor's license where you can't purchase a gun but you can use one and buy ammunition.
Gun shop, pawn shop, gun store
over and under
Blue Book of Gun Values
You need a good gunsmith
Theres alot that gos into the value of a gun . the condition of the gun has alot to do with how much someone will pay for a gun. I payed 300.00 for a over under shotgun make for sears roebuck 2yrs ago it was in fair condition
Most states follow the Federal guidelines for Airsoft - You must be 18 or over to purchase and own an Airsoft gun. Persons under the age of 18 can only own an airsoft gun with parental consent.
Have it checked over by a competent gun smith to find out for sure.
Egunparts.com, want ad, for sale ad, gun shop, gun show, pawn shop
no you will mess your gun up if you shoot it under water and the c02 is not cold enough
£475 English pounds from York Guns
Online, gun show, gun shop, pawn shop, garage sale, estate sale, for sale ad