it is NEVER an advantage to make noise,
or to run out of ammo, or to not have luminous sights, the option of a scope. It's never an advantage to be unable to forage, or to use the most likely to be found, most efficient cartridge (ie, 22lr) It's never an advantage to ONLY have a .22, when combat, or the occasional deer, cow, etc, requires more power, range, or penetration than a .22lr offers. It is never an advantage to run out of ammo, or be unable to conceal the rifle, if need be. It's never an advantage to be easy to find by enemies, or be unable to move, if a fire, flood, disease, fallout, etc forces you to do so. It's never an advantage to be too fatiqued to notice foraging opportunities, or notice signs of things that could be helpful or dangerous. So it only makes sense to choose a rifle that offers both 223 power and .22lr conversion unit, while being lw, compact, and concealable, when disassembled. It only makes sense to have a see thru scope mount, protected iron sights, a threaded, short barrel, a sound suppressor, etc.