The Armourer cover
Exodus NDS Sourcebook

The Armourer

Armour for the Fantasy, Ranged, and Modern Armories

Twenty-eight armours, helms, and shields from the padded jack to the bomb suit, with two qualities that make damage types matter: mail turns an edge and gives way to a mace, and a concealed vest stops a bullet and parts for a knife.

11 chapters, about 6,000 words, free to read here in full. Written for Exodus NDS; the stat lines also drop into a Genesys RPG game.