Road Kill,
Perhaps I am giving you credit for being smarter than you actually are. I'll try again...Oh! And I could care less if you disapprove of my use of the acronym "SAW" in this context.
[b]As defined in section 921(a)(30), of Title 18, United States Code (U.S.C:), the term
"semiautomatic assault weapon" includes certain named weapons and certain semiautomatic rifles, pistols, and shotguns that have a combination of enumerated features.
Title 18 U.S.C. section 922(v)(1) prohibits manufacture, transfer, and possession of semiautomatic assault weapons; however, section 922(v)(2) provides that any semiautomatic assault weapon that was lawfully possessed under Federal law on September 13, 1994, is excluded from the prohibition.[/b]
A named 921(a)(30) semiautomatic assault weapon [blue](hereinafter, "SAW")[/blue] is [b]always a SAW[/b], and if lawfully possessed on 9/13/1994, is 922(v)(2) exempt regardless of configuration.
Read 18 USC 921(A)(30). It reads in part:
[b](30) The term ''semiautomatic assault weapon'' means - (A) any of the [b]firearms[/b], or copies or duplicates of the firearms in any caliber, known as - ...
(iv) Colt AR-15; [/b]
Therefore, a stripped AR-15 receiver, a firearm by definition under 18 USC 921(A)(3), is a SAW under 18 USC 921(a)(30).
18 USC 922(v)(1) & (2) apply to weapon that is a SAW by configuration under 921(a)(30) only while they are so configured. The BATF theory is that once the weapon no longer meets the configuration criteria, 922(v)(1) & (2) no longer apply and the exemption, if any, is lost. I don't necessarily agree with the last part, but it is consistant with their other opinions on the subject.
If you dispute my interpretation of the BATF letter, write your own letter to the Firearms Technology Branch, give them a very detailed question and await their response.
As for the SBR question, the second opinion corrected the first erroneous one. It was the appropriate thing to do when the mistake was discovered.
And I agree with shaggy. cmjohnson's advice is right on target.
An afterthought...The FAA writes and enforces the FAR's. In virtually every instance of disciplinary action taken against a pilot, there is no right to an appeal outside the FAA's adjudication process. Be happy that the BATF must prosecute you in the relatively neutral grounds of the federal court system.