There is a way to fill it if you know anything about the S10 and if you dont do some research before you go tear up this guys ad and making accusations. The S10 is filled by removing the buddy bottle and using a fill adapter that screws on the end of the tanks valve. Yes there was a kit made so you could fill it with the bottle in place. Its really not hard to remove the bottle and fill it. If the magazines have blue aluminum or blue plastic wheels they are the newer type magazine. Based on the stock it appears to be a MK1 S10, they made a MK2 and a MK3 then discontinued the model and replaced it with the R10. They are very accurate rifles and Farmer you look to have a very nice condition one and good luck on the sale."kzz1kaw"