Got an NFA trust setup, bought a lower receiver (looking to build a 9mm SBR) and decided to use the ATF e-file system for the tax stamp. After some false steps, I have to say that the process was pretty painless. The only problem I ran into is that the ATF website has a limit on file size for uploads, so I had to save each page of my NFA trust document as a separate document for uploading (nine pages). Hopefully it will make it through the system before the new rules kick in. All in all, I was generally impressed with the efficiency of their system. Now the waiting begins ... (cue Jeopardy theme music).