They do 'take down'.
As for putting iron sights on it, well, for a smith or a well knowledged kitchen table tinkerer iron sights on one of those aren't too bad.
Some fixtures and silver soldier paste and your good, then comes the re-bluing part, you'll have to blue it again, which if you really, really search hard on the net, you can find several outfits that will do it for chicken feed.
We did an old scatter gun this past winter, you could see the heat marks where it had been soldiered, but the marking was not all that bad, the customer elected to forgo the bluing cost, we rubbed some oxpho-blue cold bluing on it and off he went, it looked....good!