I was in an emergency room one night when I was a young child.
Two people were brought in that had been drunk and got into a fight with butcher knives.
It was a gruesome sight, these two people not stabbed as much as just hacked up like a tree limbs.
It is still a vivid memory.
Just...
I believe that I sit with the theory of as many as you can justify including the concepts of;
1. Have possibly a high number of additional mags spread out among your planned SHTF caches.
2. Barter value (assuming standard mags being stored), ie 1911, ar15 other