I missfired at the gunrange as I wanted to see how that area looked as and I hit one of the things you lay down on to get a more stable firepos IRL.
And it just flipped and you could walk right through them, shoot through them.
But they only went that way when you shot at them with a gun, I tried this by throwing HE Grenades at them to see if they behaved the same way.
I did record this and here is the addres for my video http://www.youtube.com/watch?v=UOFJf9ECo3Y
Also my friend found a bug also which I sent into the webbsite also
Also I noticed that if you stand behind them you can see through them, but if you stand infront of them you cant see through them.
They give no sort of cover at all, tried shooting through them and the bullets did go through.