The M82 is a beast of a gun. It fires the same rounds as the .50 cal machine guns that we use. It's heavy and extremely loud. You'll see what I mean in the movie below - it literally causes a shockwave that shakes the ground enough to raise a big cloud of dust for like a 4 or 5 foot radius around the gun. I've used the rifle a lot in computer games like Ghost Recon, so I was eager to see how it handled in real life. It's got quite a bit of kick, and of course the games don't do the noise or shock of firing it any justice whatsoever. I'm sure firing it from anything but prone and braced position would knock me on my butt.