Here’s a weird fact: Every time someone buys an assault weapon in the US, such as an AR-15, they’re funding wildlife conservation. The same is true if they purchase a handgun, a shotgun, or any other kind of gun or ammunition. That’s thanks to a law most people have never heard of: the Federal Aid in Wildlife Restoration Act , commonly known as the Pittman-Robertson Act. Passed by Congress in 1937, the law channels revenue from a tax on firearms, ammo, and archery equipment to state wildlife agencies — government organizations that restore wildlife habitat, monitor threatened species, and oversee hunting and fishing. Levied on firearm manufacturers and importers, the tax is 11 percent for long guns and ammunition and 10 percent for handguns, and it sits on top of other common taxes. Over the last decade, the law has channeled close to $1 billion a year into state wildlife agencies across the country, amounting to a substantial share of their budgets.…