I've ported a lot of weapons into the Call of Duty games I've worked in. The weapons come from various games. I ported most of the weapons into Call of Duty 4 because once a weapon is in Call of Duty 4 it is just a few easy steps to add them into the newer games in the franchise. Some were ported directly into Black Ops 3, and a few I animated myself.
Call of Duty 2 Weapons
I ported every Call of Duty 2 weapon into Black Ops 3 to create the Call of Duty 2 weapons mod.
Custom Animated Weapons
I'm not the best 3d animator in the world, in fact other than these weapons I have no experience in animation at all. For having no experience at all these turned out pretty good.
Modern Warfare 2
I ported weapons from various Call of Duty games into Call of Duty 4 for mods created by other people or for me to use in World at War Zombies mods. Here are some of them.