I have rifle that I tax stamped into a SBR; I'd like to revert it back to a rifle. Now it doesn't currently have a SBR length upper/ barrel attached it's essentially stripped. Do I just write the ATF as in their laws * 5320.4 and ask them to remove it from the NFA registry and wait about a week? Or is there more or less steps I'm missing? Just would like absoulute assurance what I'm doing is right and not gonna come back to me with any issues.