Here's the crazy dual wield mod that I worked on for Call of the Dead on Black Ops 1, forged from the ideas of TheRelaxingEnd.
Compilation of the Weapons (Ray Gun Mark 2 isn't in the mod anymore, RIP):
MOD OF THE DEAD Release (Dual Wield Mystery Box & More!) BO1 Zombies Mod
Install tutorial/last addition to mod:
Mod of the Dead - Release
HitmanVere's Shaders (Place in "main" folder):