There's a video of a shooting show on Google Video. I don't know too much about firearms, so I can only make some guesses at what's going on there.

It opens with a young girl (less than 10 years old?) firing a machine gun deployed on a tripod. It sort of looks like an FN-Paramilitary to me (sorry for the crappy link, but I couldn't find good pics of the FN-Para online) due to the handle thing at the top and the boxed ammo.

I'm surprised to find out that the recoil on the FN-Para is low enough that the girl can actually handle the weapon. I know the tripod is "helping" her, but I still imagined it would have jiggled more.

In the next scene, around 0:14, they start shooting at a car. There's one distinctly powerful fully-automatic firing going on, and based on the sound, I bet it's the same weapon that the girl is firing. You can see from the dust clouds that the bullets are landing all over the place, showing that the FN-Para really is not an accurate weapon. But you also see the car getting destroyed pretty quickly, showing that at high fire rates, you don't need to be very accurate.

At 1:13, you see a guy dual-wielding these machine pistols. I have no idea what they are, but they fire insanely fast. He empties his clip in just over 1 second. Crazy. And pretty useless too.

Then there's some demolitions which I don't find too interesting.

At 1:45, you hear a buzzing sound, and I can only assume that it's some sort of minigun being fired. Yes, that continuous buzzing sound is the sound of gunfire. You never actually get to see the minigun which is disapointing. They are typically mounted onto helicopters or tanks, so don't expect a human to be walking around carrying one.

At 2:05, I'm seeing sparks, and I assume those are tracers (as opposed to, say, missiles). When you're spraying rounds, it can sometimes be difficult to see if your aim is off or not, so some guns have tracer rounds. That is, every 20th or 100th or whatever (depending on your fire rate) bullet will light up to show you which way you're shooting.

The video becomes repetitive after that. You see the girl firing the mounted machinegun again, some night time firing, and some more demolitions.