You can certainly buy a Model 28 and then maybe you can find a 3-1/2 inch Model 27 barrel somewhere, then send it off to a really good gunsmith who can swap the barrel, checker the top strap of the frame, polish everything to a brilliant shine without smearing the roll marks, then give it the correct electroless nickel plating. By the time you pay for all of this you could have bought a nickeled Model 27 with the rare 3-1/2 inch barrel and you will have a Model 27 that will continue to appreciate in value rather than a money pit Model 28. It's your money, do with it as you please.