This is the OP. I ended up buying a Marlin 1895 .410, current offering with screw in chokes. It doesn't have the deep blueing or dark stock finish of the JM marlins, but it's decent. I've already popped 4 snakes and 2 skunks.
I do plan on rubbing the stock down with some more oil. Any suggestions? Tung oil, linseed, tru-oil?