I looked at the ATF website and did find the PIAT specifically listed under this provision:
Quote:
Section IV — NFA firearms classified as curios or relics, still subject to the
provisions of 26 U.S.C. Chapter 53, the National Firearms Act, and 18 U.S.C.
Chapter 44, the Gun Control Act of 1968
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So...it seems it IS a Class 3 device. So bizarre that a giant spring loaded caulk gun would be listed as such.