In this video the Backyard Scientist uses every day items to build a series of rifles. Are they powerful? By the time the video finishes we’re able to launch golf balls further than the video can track and we’re blasting holes in beer cans.
Also; pretty blue flame.
If you want to build one of these fully operational gas rifles yourself then there’s good news. The Backyard Scientist has included instructions on how he built his. Grab them while you can.