On top of the FOPA machine gun restrictions, any NFA weapon imported into the US after the Gun Control Act took effect (end of 1968) cannot be transferred to an individual. See 26 USC sec. 5844. They can be transferred to SOT’s, without any police demonstration request, and kept by the SOT after surrendering his SOT. These are sometimes called “pre-86 samples“, or “dealer samples”, although dealer sample can be used to refer to either a post-86 machine gun or any NFA weapon imported after 1968.
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MACHINE GUN SEARS AND CONVERSION PARTS