Steel chainmail is a simple, yet very interesting technology.
It’s incredibly hard and impervious to tearing, but it’s also very elastic.
In a set of chainmail armour we can just lay down and wait for the enemy to come. Only for them to break their rotten teeth on the armour.
Chainmail will never run out of ammo, it will never jam, it works in every direction, during day and night, fog, everywhere. You can put it on children, elderly, the blind and even leftists and vegans. Everyone.
The answer to the zombie apocalypse was known by the bloody knights, the ones whose advanced technologically vehicles were fueled by hay and whenever they needed to take a dump in their castle they just put their ass out on the edge of the window.