( warning language)
That scene is impossible in so many ways but epic in it's awesomeness.
It's impossible because those guns are powered by a battery or generator and when they made that movie they actually wired it up the actor's leg.
Second the recoil will throw you like a mule. In fact a later movie Soldier Staring Kurt Russel had his Character fire one, The guy shooting it was thrown into a pond, so they reversed the shot and it looks like Todd comes out of the water minigun blazine. the actors in predator were being held up by a rig.
Third I don't care what caliber is it there is no way in hell a human being can carry enough rounds to fire that long string of fire seen in predator but as to the forestry work?
well Larry Vickers
[video=youtube_share;BoEOoUeDFAE]http://youtu.be/BoEOoUeDFAE[/video]