Always wanted an airsoft gun but never could get over the cost to buy one? In this DIY video, you’ll see how to make a fully-automatic airsoft gun using a soda bottle and compressed air.

(Related: Meet the man who builds amazing giant slingshots — and see them in action)

Check it out:

Materials for this project total about $15. SlashGear explains the design:

The concept is simple; you pressurize a soda-bottle full of airsoft pellets and give the air only one way to escape, through a barrel, out the cap and, ultimately, into a target. The assembly process is simple as well, requiring only that you drill two holes and mess around with a little hot glue. It’s child’s play.The result is a jurry-rigged device that completely justifies its appearance within mere seconds of use.

DIY Airsoft Gun Made With Soda Bottle

DIY Airsoft Gun Made With Soda Bottle

DIY Airsoft Gun Made With Soda Bottle

DIY Airsoft Gun Made With Soda Bottle

The creator of this YouTube video has several how-to projects loaded on his channel and blog, GrassRoots DIY, ranging from homemade fireworks to how to raise a pheasant and other chemistry projects.