Some interesting responses. I had rather gotten the idea from the sites that 03 FFL holders themselves didn't realize that the license was good for more than milsurp. Maybe we can educate everyone.
One place to start might be comments like "I have had several FFL holders insist that you MUST have a FFL to ship a gun and to not do so is illegal."
An 03 FFL IS an FFL, though one limited to a certain class of guns, and there is no restriction on who can ship a gun, only on who can mail a gun. The restriction is on to whom a gun can be shipped in interstate commerce.
There is a change in the works with USPS, I understand, but the wording of the change is very ambiguous and confusing.