Milk Carton is a Source-engine based multiplayer mod featuring extensive weapon customization. So extensive that is does not even customize existing weapons but allows the player to create their own guns.
v1.3 full update. Erase all previous versions before installing.
Full Version of Milk Carton v1.1. To install, extract into your steamapps/sourcemods folder, (overwrite any existing files).
Full version of Beta1 of the Milk Carton mod.
To install, extract the folder into Steamapps/sourcemods