im making a training map and im trying to make an area where you have to crawl under barb wire, with mgs firing overhead

is there a way to make them shoot at a wall or anything else other than the player...

using the func_tank entity

Excellent question. Nobody answers so here are my 2 cents. I'm afraid it is not possible using a func_tank, since it is programmed to only shoot at players.

You could simulate this effect by:
-creating a big old sprite for tracers (something like rain, in more brutal)
-using a env_shooter throwing bullets (this one rocks)
-or make what fuzzdad used for flugplatz. He said he would release a test map with this effect. env_beams directed to an invisible func_train.

Actually, in real life you can't see flying bullets. You just hear them flying above your head in a deep tone.

ok, an env_shooter would work... do i just make an ambient_generic to make the gunfire noise?

and another question, with an ambient_generic will it still make the zings when it gets close?

No. All ambience_generic does is play a sound so there aren't actually bullets. You don't need to worry about the bullet whizzing sound neway, it is not that important.

@ Kruger: I thought you can get a func_tank to fire at a info_target?