Follow along on this fun weekend project as we build a CO2 Cartridge Rifle. Only rather than being powered by the CO2 Cannister, this one uses the cartridge as the ammunition!!! I spend a lot of time shooting my Umarex Walther CP99 CO2 BB Pistol in my back yard. I've always got a pile of these empty CO2 canisters laying around, and that gave me an idea. Let's turn those into projectiles! Recycle them into ammunitions. Amazingly, they work extremely well! Why all the fuss about 3D printed guns? Who needs a 3D printed gun when you can build one at the hardware store in 20 minutes? No background check required. To see a review of the Walther CP99: http://www.youtube.com/watch?v=8XVWbtnXwio Check out Awesome Airguns here: http://www.youtube.com/user/awesomeairguns Check out David's review of this at Awesome Airguns: http://www.youtube.com/watch?v=H1SFiN9ij3c Parts List and PDF Plans: http://www.thegeekpub.com/1386/how-to-make-a-co2-cartridge-rifle/ NOTICE: This project is dangerous. You could hurt or kill yourself, or others, or cause property damage. Adult supervision is required at all times. You assume all risks. This is not a toy, and must be used with extreme caution. Wear eye and ear protection at all times and take other precautions as necessary. If you hurt yourself, it is your fault. Don't try this at home, unless you are prepared to accept the risks. If you build this project, make a video and post it as a video response to this video! We want to see it, and we want our viewers to see it!