He says it falls under other weapons? I assume he means a class 3 AOW(any other weapon), right? The transfer fee for AOW's are $5 and require a Form 4. The thing about AOW's and many other class 3 firearms are the specific state regulations that govern the sales of these types of firearms. This is where the state laws get really nit picky. Check this link for a list of all states and what they allow:
http://www.mp5.net/home.htm. Another thing that I think would make this sale pretty hard to make to an individual citizen, is the fact that the ATF form 4 must be filled out specifically for this firearm when it is tranferred. Generally, I hear people wait a few months to get the go ahead from the ATF, not to mention all the leg work you have to do yourself, including getting a signature from you Chief Law Enforcement officer unless you are incorporated. So, I guess perhaps a "civilian" could buy this gun from the individual and then get the serial number and specifics, apply for the tranfer and then wait for the paperwork. But it sure would be a pain in the ass! On the other hand if you have the right FFL, don't remember the type, I don't think you'd have as many problems.
I've really been interested in loooking into the Class 3 weapons lately. They are very pricey but are a great investment and you don't normally see alot of at the range with their own full auto weapons. I've thought about maybe starting out with a silencer for my AK or Glock, and then jumping up to a firearm. Transfer fee for most class 3 weapons is $200, not $5. Anyone around here have any class 3 firearms or silencers?