Plutonium

@twizzyrxv it's called ~-gray_gun.iwi It's in iw_10.iwd, Ray gun is two words

@twizzyrxv All the Textures are in .IWD files inside <BO1 Directory>\Main. You can open .IWD files with 7zip.

iw_00.iwd through iw_14.iwd are textures for the base game (i.e. Campaign, character model and view model, all guns exluding wonder weapons with the exception of the Thunder Gun and Winter's Howl, Base Multiplayer maps, Base Zombies maps including Dead Ops, et cetera )

iw_25.iwd through iw_27.iwd are textures for First Strike (Ascension)

iw_29.iwd through iw_31.iwd are textures for Escalation (Call of the Dead [VR-11, Scavenger, Wunderwaffe])

iw_33.iwd and iw_34.iwd are textures for Annihilation (Shangri-La [31-79 JGb215 "Baby Maker"])

iw_36.iwd, iw_38.iwd, and iw_39.iwd are textures for Rezurrection (Moon, Nacht Der Untoten, Verrückt, Shino Numa, and Der Reise [Zap Guns/ Wave Gun]

the rest are all sound files

Hope this helps!