Homemade Air-powered Rifle

This is an incredible build, utilizing basic plumbing parts and a little wood. The rifle is not kind of rifle that people generally think of when you say 'rifle', but this think can do some damage.

Instead of a standard 'bullet', this thing is firing darts built out of nails, with enough power to put them through solid wood, and enough speed to slice through three full pop bottles in milliseconds.

The best part about the piece? Watching the video, I feel like I could build this: