You can subscribe to ALL mods in here, all weapons will be replaced, except for the uzi, the graphics and effects will be greatly improved, all the four characters of L4D2 will be replaced by RE characters, special infected were also replaced, and I found

These "Proper" mods make the vanilla weapons better. No change has been made to velocity and damage of the weapons' projectile, but to projectile range, large gatling turret's fire rate, tracer, muzzle effect and muzzle sound effect only. You can have only