I would have expected Rush Limbaugh to fly into a tizzy over the now-infamous "Fast and Furious" operation. But I would not have expected him to take the more complicated route to outrage.
As you may have heard, recently the ATF decided to stage a "gunwalker" sting. In these stings, the ATF allows illegal guns to be sold to people. It then bangs on those people's doors and arrests them for owning illegal guns. Entrapment? Sure, but somehow it's legal.
This particular gunwalker sting was internally called "Fast and Furious." (Presumably after the crappy Vin Diesel action movie. Crazy, but whatever.)

The ATF set up a patsy at an Arizona gun show, who sold a bunch of illegal automatic weapons. The buyers promptly snuck the guns across the Mexican border and sold them to drug lords. In short order, the guns were used in crimes against Americans.
Everything went "right," according to the ATF's plan. Except that they didn't really have a plan for retrieving the guns and imprisoning the offenders. Oops?
Most Right wing conspiracy theorists are shaking their heads at yet another story of heavy-handed governmental interference. Randy Weaver's name comes up again and again. (Randy Weaver is widely believed to be the victim of a gunwalking variation, wherein an ATF agent told Weaver to illegally modify a legal weapon, then charged him for doing so.)
The party line here is that the government shouldn't be infringing on our Second Amendment rights in the first place. And look what a hash they make of it, the incompetent boobs! (Frankly, given the circumstances, it's hard to argue with this line of reasoning.)
But Rush Limbaugh goes in an entirely different - and much more bizarre - Second Amendment direction. According to Rush, the ATF's debacle is actually a Left wing conspiracy to have the Second Amendment nullified. In other words: IT ALL WENT ACCORDING TO PLAN.
You see (Rush explains), when people read the story about the ATF's gunwalker campaign gone wrong, they will think "Guns are bad! We should ban those!" At which point every Liberal in the country rubs their hands together and chortles aloud in a maniacal fashion.
If Rush Limbaugh thinks that's the take-away point from this story, he really is tone deaf (figuratively speaking - I know he's tone deaf in the literal sense). I can't imagine anyone looking at this example of governmental bungling and getting "gun control" out of it. Since when does 1 + 1 = 329?