http://chenghaitoys.en.alibaba.com/p...k/showimg.html
There's a local hobby shop I frequent for all my hobby model needs and such. He's kept one or two of these above in stock. Right now he has a Tiger II and a Sherman. They do fire BB's, or so it says on the box when I read it at the store. I went for the $25 ones he had before though. They're hand sized and use infared sensors and such to tell when they're hit and they shake when they get blown up and then you got to wait for a timer to go out to get back in the game. It lets up to four tanks interact but gets mixed signals when you get more in there. Overall fun is pretty good.
Though the larger ones are more fun for looking more acurate.....