Create weapons using any prop from the game. Select the type of weapon you want to make and enable the Equip Custom Weapon option.
Now navigate through the options and start building your weapon using props from the game or addon props. If you want to use an addon prop, you need to type the name of the prop you want.
After finishing your weapon, you can save it and share it. All weapons you make will be inside the WeaponForge folder inside the scripts folder.