You're far more likely to run out of ammo before you'll need any of these items. The likelihood of losing something in the field is greater than breaking something in a properly maintained rifle. Remember, how much ammo can you carry with you? Its HIGHLY unlikely you're carrying enough to wear out a quality rifle. Now, a shelter-in-place situation could see parts breakage.

This leads me into another related comment...

You should have two of anything you consider primary. If you consider your 10/22 a primary firearm then you need:

Trainer - this is the rifle you shoot, practice with, haul around in the field.

Emergency Reserve - this is the rifle you test, sight in, and then clean and store with your gear. This is a low round count rifle reserved for an emergency.

Personally, I don't want to have to depend on: A) a high round count weapon; B) an untested weapon. Redundancy addresses both issues. Obviously, if you choose an expensive design (AUG, SCAR, etc) you're going to be saddled with a high investment cost. ETA: This is where a high quality DI AR15 shines. Currently, Colt ARs are in the $800 range. You can buy two Colt M4 Carbines, (20) 30rd Mags, and 1,000rds of ammo, and an Aimpoint PRO for the price of a plain FN SCAR-16 (5.56 version). Alternatively, you can buy (2) Colt M4 Carbines, (20) 30rd Mags, and 2,500rds of Ammo for the price of the same SCAR.

(2) Colt M4 Carbine = $1700
(20) 30rd Mags = $200
(2,500rds) Wolf Ammo = $625
____________________________
Total Package = $2,525

Street Price of a SCAR-16 is $2300-2500.