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Old March 20, 2011, 10:25 PM   #11
jmorris
Senior Member
 
Join Date: November 22, 2006
Posts: 1,612
I never bother with contacting them any other way than talking to a person. The # to the NFA branch is 304-616-4500, unlike almost every other government office a real person will answer.

Here is a bowling ball cannon I built using compressed air and a ball valve.



Smooth bore BP morters are also OK without stamps.
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