It's down-right hard to keep track of all the federal legislation that gets passed. Even the NRA didn't pick up on this, as evidenced by the 10-19-2012 date on their article.
So don't feel too badly you didn't know. I suspect this was an amendment that was tacked on (in one of the Houses) and no-one really thought much of it. Or the consequences. Hence, no publicity.
We really need every hunter and sports-shooter to contact their Representatives and Senators and voice our opposition to this withholding of much needed funds -- Before they all decide to raid it, as was done years ago with the Social Security Trust Fund.
It is much easier to stop this now, rather than wait for what comes down the pike.