I am not quite sure about that last part, as I understand it a manufacturer does not need a demo letter to make anything, nor does he have to request permission from the ATF. A (properly licensed) manufacturer can make anything allowed by his license and he must notify ATF within 24 hours of doing so. A dealer must have letterhead requesting a demo to get a post 86 sample but a manufacturer does not need anything to create. One manufacturer made a machine pisol just to test the effectiveness of his compensators, I don't think it would be practical to get letterhead for that kind of T&E.
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