Below are my introductions about Wii Zapper and Wii Vibratile Crossbow, players who love Wii Gun can make your choice.
The design of Wii Zapper is very good and more like a pistol. A butt is loaded on the back. Pistol grip position is on the back of the B button in the remote Wii Cables controller, so the player pulls the B key trigger not the Z or C key when holding the handle. At the same time, there is another trigger on the Wii Zapper, which is used to increase the height of the short B button and the hand-feel of trigger. Therefore, the first part of Wii Zapper took up is like a real pistol.
Wii Zapper made with ABS engineering plastics, and this plastic’s performance has been verified in countless games products with excellent impact strength. Surface is very smooth, one after the other grip in Wii Adapters order to increase friction, specially made with a matte surface. It is relatively simple to install.

Now there is a brief introduction of Wii Vibratile Crossbow:
Easy to install
Natural nunchuck trigger combined with the functional innovation of the Wii remote.
Ergonomically balances san weighted crossbow.
Maintains Wii innovation motion
Full access to all buttons and digital pad.
Operating instructions
simple intuitive easy to use the Wii Vibratile Crossbow gives you a unique way to play target games on the Wii video game system designed to increase control and enhance game play.
The Wii Vibratile Crossbow helps steady your hand and improve your aim on a range of action-style games.
Just load your Wii remote and nunchuck into the Wii Vibratile Crossbow and use the trigger to rapid-fire at all targets in your way.
Both have advantages attract you, Wii Cases you should think it over.