I have a guy with an A.H. Fox/Sterlingworth and wants to do a trade for it. It is a 12ga.,30"bbl, full/mod. Good conditon, shinny bores, and locks up tight as vault ( his description ) I need to know what questions to ask him about it `cause i`m not to savy on this make of double. The trade offer he wants is for a firearm worth about $550.00 which makes me wonder why he would let it go cheap unless that`s all it`s worth. I`ve seen these double go for a lot more and it`s raised an eyebrow. I have a St. Etienne that needs reloading and wanted something that shoots modern ammo. Will the Fox handle that ?