The way I read his post is: the 16 gauge is in near perfect condition and the 20 has only been reblued and refurbished. Rebluing by Simmons won't reduce the value that much. Simmons reblued and refurbished my Model 21 twenty gauge and I'm sure now that it is back in like new condition that I'll be able to get more than the $2800.00 that I paid for it a few years ago....... Put a nice Model 12 20 gauge with a vented rib (that has been gone through by Simmons) next to one with screw in chokes on a table at a gun show. Ask the same for each gun and see which one sells first. So, yes, putting in screw in chokes will decrease it's value even more. But it's his gun so he can do whatever he wants. I took it he was asking for advice so I gave him mine.