I have a 20 ga 37 Featherlight Ive had since a kid, it was my first shotgun. I cut that barrel down to 18" long ago and still haven't got around to putting a front sight on it. Even without it, its still killed a lot of rabbits, squirrels, and a few other things. My SKB took its place as my main hunting shotgun long ago too.
I also have an old 12ga 37 Featherlight that has the extended mag and 20" barrel and brass bead front sight.
I also have a Remington 1100 with a 20" barrel, extended mag and rifle sights, and an old Mossberg 500 with the same. I think if you're going to use slugs, and shoot anything beyond buckshot ranges, the rifle sights are the way to go.
Personally, and even though they are a bit fragile, I like the old Ithaca "Raybar" front sights the best.
The Remingtons and Mossbergs. etc, are definitely heavier, and you know you're shooting the Ithaca's when you're shooting heavier loads, but they are a lot nicer for day long carrying around, and just in general.
Of all of them, I always like the way the Ithacas were set up, and handled. Not having a disconnector was great fun too, but you tend to grow out of that. Well, maybe.