Some time ago I was reading up on the above mentioned items, and I happened across a scan of an Oregon bill or law (wish I had saved it now... hindsight, right?) that read something to the effect of "if an SBR/SBS/AOW/Suppressor/whatever was assembled in the State and never leaves the State, then it does not need to be registered on a Form 4." Crazy as that may sound, I've seen an official document from our neighbors in Idaho that says the exact same thing. No, I don't remember exactly what it was called, but perhaps someone more knowledgeable could chime in. The intent of this thread is to either dig up that article and make it available for the masses so we can give a big bubblegum you to the ATF, or to disprove its existence beyond all doubt so we know if we're breaking the law or not. So, my brothers and sisters of NWFA, let the search begin! I'll post up here if I find anything, of course. Happy hunting! In a slightly unrelated, however handy bit of Internet knowledge, I present the forum with a letter from the ATF in regards to buffer tubes on pistol ARs.