Plusblow 4

Use your lungs to rapidly fire darts from Nerf magazines using this breech fed blowgun, or adapt the mechanism to your own homemade blaster. The pump grip can be cycled repeatedly to load multiple darts for a shotgun effect.

This toy can fire nerf darts at higher velocities and ranges than a standard Nerf blaster. Eye protection is required to prevent serious injury.

https://www.youtube.com/watch?v=ygJhwYmyEBc