Yes, that is an actual screenshot from an actual political ad starring someone who wasn't even born in America who would like to be your president. (The video's embedded below.)
As Rachel Maddow points out: That's no machine gun. It's an AR-15 semiautomatic rifle. While it's true that the AR-15, like the machine gun, is basically only good for shooting and killing human beings in mass quantities, it's not an automatic weapon.
You know how I know that the AR-15 is good at killing human beings? Because James Holmes, who's just been convicted for killing 12 people in Aurora, Colorado, used the same kind of gun when he walked into a midnight movie and killed 12 people. Adam Lanza also used an AR-15 to kill 20 children. And Jacob Roberts killed two people in a mall in Portland with the same kind of gun.
Here's the video—produced by conservative media outlet IJ Review:
Go pretend to be shooting human beings in some other reality, you fucking giant cackling baby.