This is a paid asset, but now you can download POST-APOCALYPSE ICONS GAME PACK 1 Free.
Detail this asset from Unity Store: Original Link
POST-APOCALYPSE ICONS GAME PACK 1
Set of 10 post-apocalypse icons. Resolution of png file 512 × 512 . Suitable for use in RPG games, etc.
THIS PACK INCLUDES ICONS:
Firearms and bladed weapons;
Clips for weapons;
Crowbar and toxic poison.