[mpeastend]

JYL, I think this is the information you are looking for (with acronyms explained):

You will go to a class 3 SOT FFL dealer (Special Occupational Tax Federal Firearms License) in your state and fill out paperwork to apply for a $200 tax stamp for the purchase or manufacture of an SBR (short barreled rifle). You will also need to get fingerprinted by a local law enforcement agency. That paperwork is submitted to BATF and then you wait for approval. It used to take a long time but the wait time has dropped to 3-6 months now because some aspects of the application are electronic now. If you've ever been arrested I would check with a lawyer specializing NFA trusts (National Firearms Act) to see if you would be denied based upon your particular situation. I say this because it is expensive to buy or have the gun manufactured and then have the dealer hold onto it until your tax stamp comes in plus the application, fingerprinting & $200 tax stamp also cost money. If you are denied, I believe you eat those costs (not sure on the $200 tax stamp, I was not denied, so don't know) but you are kind of at the mercy of the dealer holding the gun you paid for. I don't think the dealer would hose you but in the case of you having a specific SBR built that he can't readily sell to another party may mean that you take a partial loss.

If you live in California, you are possibly out of luck. The NFA allows US citizens to buy machine guns that already exist in the BATF registry, silencers, SBR's, destructive devices, SBS (short barreled shotguns), etc. The individual states then can add additional restrictions. CA only allows SBR's as Curios & Relics only. A newly manufactured SBR that you want is not in this classification.

Oregon is good to go for all aspects of Title II (NFA) firearms.

Washington state allows SBR's & silencers but won't allow machine guns.

BTW, once a gun is made and registered as a SBR you cannot undo that. Lets say you have a SBR AR15 with a 7.5 in barrel (that is a real flamethrower in low light!) and want to move to a state that won't allow possession of it, you cannot swap out the barrel or upper for a legal 16" barrel. The gun will have to be sold to a class 3 dealer or to another person through a class 3 dealer. Hopefully you don't live in CA so you can realize your dream.