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Letter from the ATF

The device you have constructed is made of machined aluminum. It is breech loading and it uses a propane/oxygen mixture as a propellant. It also has a sling and appears to have two hand grips. You did not indicate the method of ignition or provide any dimensions. You indicate that you use the device solely for launching potatoes for recreational purposes.

[from spudgun technology center ]
The device clearly has features and capabilities which extend beyond a conventional potato gun; however, based on the information provided, we are unable to determine that it meets the definition of a firearm or a destructive device at this time.