There's a local machine shop that has a side gig (Mountain View Arms) making what they call the pack-rifle. I think it's now been copied by others but it's pretty interesting:
15.5 oz 33" OAL 17" takedown length 7/8" width 4" height .22LR Adjustible Peep
Upside- standard 10/22 , mags or various sizes, ability to carry lots of ammo.
Downside - limits of .22 for range and take-down, plus associated cost of turning into lightweight backpackers gun.
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Possible that the 10/22 chargers will soon have replacement barrels from tacsol or volquartsen, then you'd really have the ultimate backpackers carry gun.