Mosin-Marauder said:
So, don't jump all over me for assuming this, but the way I read it, it's going to very hard to turn this letter into legislation?
It doesn't have to be legislated.
There are laws already on the books that delegate to the BATFE the authority to adopt regulations by which to carry out previously enacted "umbrella" legislation. The BATFE then follows a process under which regulations are adopted and, later, amended. For example, the Americans with Disabilities Act is a law -- and it created a federal body (the Access Board) to write regulations for the purpose of making America more accessible to people with disabilities.
The agency proposes a draft of the regulation. They then submit the draft to public review and comment for a period of time. After the public comment period has closed, the agency reviews the comments, takes the ones it likes and modifies the draft regulation, and then it gets published in the Federal Register. Once it has been published in the Federal Register, it has the force of law. And it doesn't go through either the House or the Senate, and the President doesn't get to veto it.
Surely you've seen some of the many posts on this site discussing concealed (or open) carry in National Parks, federal facilities, and post offices. Those aren't "laws" being discussed. Notice that when the actual language is quoted, it's attributed to "CFR." [As in 49 C.F.R. § 1540.111, the regulations covering travel by aircraft with firearms.] CFR is the abbreviation for "Code of Federal Regulations." It's a HUGE body of work, and something i the CFR probably affects every single person in the U.S. in some way every single day.
And then there's the U.S. Code, which is where the actual laws are collected and published.
http://www.usa.gov/Topics/Reference-Shelf/Laws.shtml