Introducing the GreerTech Launcher Model 2021, or GL-21.

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The GL-21 uses evaporated isopropyl alcohol inside a 3D printed combustion chamber to launch a 3D printed projectile.
The combustion chamber is ignited by a normal BBQ lighter.

 

Due to the lack of barrel, this weapon is considered legal in most places where normal guns are outlawed. Check your local and national laws to ensure.

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UPDATE: YOU WILL NEED TO CHANGE THE SIZE OF THE PROJECTILE IF YOU CHANGE THE SIZE OF THE CHAMBER.

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I AM NOT RESPONSIBLE FOR ANY CRIME COMMITTED BY THE CONSTRUCTION, POSSESSION, OR USAGE OF THE DEVICE DESCRIBED IN THIS WEBSITE, FILES, OR INSTRUCTIONS.