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Not for shooting Nerf darts. I put it on the Nerf blowguns I made for aesthetic purposes.
You want there to be a good seal on the outside of your mouth in order to get more power. The larger opening that covers your lips completely ensures a great seal. However, it is not that big of a deal when using Nerf darts as ammo. If you were using real blowgun ammo and hunting, then the mouthpiece would definitely help out.
Simple Key Organiser
Minimalist Keyring (Swiss Army Style)
DIY Multifunction Pocket Tool
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