I assure you that under the right circumstances, 20 loaded mags would be mighty comforting.
Ah yes, I have many, many AR mags; 20 and 30 round USGI, though I prefer the 20. The way I look at it, without a magazine you have a very slow operating single shot.
And M16 mags were issued as "consumable expendables" back in the day, so I still think you got to be able to replace the ones that go bad.
As far as a basic load goes, my philosophy has always been ammo and water first. Everything else is secondary. My "grab and go" gear consists of my web gear that only has one pouch for 3... or is it 4?
- 30 round mags, but I also have 2 bandoleers holding 7 - 20 round mags each. Of course the rifle is an A1 clone, real retro... just like me!
The magazines sit, and have for some time, cleaned, loaded, sealed in issue protective bags and tucked in their bandoleers. Lately though, I have given up expecting the 'can hordes or zombies to sweep down on my 'hood. I have all but resigned myself to the fact that I am doomed to die, old and infirmed, in bed....