Tube magazines wouldn't be practical in a modern rifle for a couple of reasons. Magazine capacity and and bullet selection. Not to say that they don't work well for short action carbine and pistol cartridges but think about the logistics of a tube fed 270 win. I wouldn't classify a lever gun as a lightweight option. I know for a fact that my Savage 99 has way more steel on it than my Stevens 200 and is considerably heavier than a bolt gun with a comparable barrel length. Nothing makes you feel more American than toting a nice blue and walnut through the woods, though.