Tony, why do you care so much about realism?
This game has infinite ammo laser rifles, zombies, sentient robots, and miniguns that fit in mailboxes, stars a bulletproof man who stores hundreds of kilograms of items in his ass, a watch that can teleport you, and an RPG-like level-up system.
It's not supposed to be realistic.
Also, until you start providing links to all these mods you download, i am skeptical that they even exist.