Question one; "Who is selling this gun." Question two; "Is the serial number stamped in Winchester style on the water table of the barrels?" Question three; "If the barrels were installed aftermarket on an original 20 gauge gun, would it still be worth the price you are paying?" An original 20 gauge field or skeet grade gun with SST and AE is about an $8000 gun. A set of 20 gauge original barrels are worth about $2000. A similar set of 28 gauge factory barrels may be worth about $4000. The gun, if it appears absolutely original, but without documentation, is worth maybe $10,000 as a shooter, no more as a collector gun. Sorry if this doesn't jive with your $30,000 comparison. If you are interested in originality for future resale possibilities, maybe you should call Tony and ask him if he put the gun together from parts. He may tell you the truth. Personally, if the price were over about $9500.00, I would order a new gun from Tony.