I want to know if I need to buy a Nintendo Wii gun for each specific Shooting Game available for the Wii? Can I buy one Nintendo Wii gun and I can use it for all shooting games with the Nintendo Wii? Do certain shooting games like Call of Duty or Reside

Just buy one gun for any shooting game because you don't really need a "specific gun" or buy all guns for shooting games. I advice you to buy a gun you feel comfortable with and use it for all the Wii games. Here you have a few models you can choose from:

I recommend this plastic machine gun. It possesses a life like mold, yet its white plastic color prevents it from being mistaken for an actual gun. To operate, place the Wii remote in the top cradle of the gun and the Wii nun chuck in its outer grip. After attaching the controllers, manage the wires by using the cable slot and close the top cover. Adding to the authenticity of its appearance is the sound produced by the cock and load action of the movable, outer grip. Remove that same handle to give your machine gun a compact UZI appearance.
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I recommend it because it features Removable stock and barrel for use in three different modes.
Authentic size and lightweight with high quality construction
Works with Wii shooting and hunting games
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I recommend this authentic size and feel yet distinct toy gun white color.
Removable stock and barrel / magazine tube.
Buttons on the shotgun access C and Z buttons on the Wii Nunchuk / Pull trigger to push B button on the Wii Remote.
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