From Guns.com:

Now law, the move tweaks the Pittman-Robertson Wildlife Restoration Act. This 80-year-old law uses an 11 percent excise tax levied on all guns and ammo commercially sold or imported into the country to perform conservation-related tasks such as restoring habitat, funding hunter safety programs and establishing public ranges. Paid for by firearms industry manufacturers, conservation officials announced over $670 million in Pittman-Robertson funds would be available to states this year alone.