Sorry—dumbass move by me—it’s on Gun Trust lawyer blog, not ATF, which was why I couldn’t find it on ATF’s site:
-“ATF has recently updated their forms and now requires notification when you move within a state for any NFA Firearm. This can be done using the 5320.20 form which is described on this page. While the document states that it is not necessary when moving across state lines for a suppressor, it is now required by the instructions on the Form 4. Regardless of how you feel, we would recommend that you complete a Form 20 for any move even if across the street.
The ATF requires prior authorization after a written request to transport any destructive device, machine gun, short-barreled rifle, or short-barreled shotgun under Section 922(a)(4), The ATF does not require this prior authorization for a suppressor. While the prior authorization from the ATF is not required, we do still recommend obtaining an approved Form 20 from the ATF for Suppressors before crossing state lines. We feel that it is better to have a document from the federal government stating it is legal to be in possession of the item in another state than is listed on your Form 4 or Form 1 which was used to acquire the item.”
My mistake—thank you. More coffee.....