I believe it is real! They took the second video to prove it was real, watch here!
"Apparently, Mythbusters is going to film a segment to test the incredible case of the spinning bullet on ice. Many people are discussing if this is possible or not. After watching it repeatedly and reading the arguments, I believe it. Some people say that this is impossible. How can a .40 caliber bullet stop on the ice like that, losing all its forward momentum and still keep spinning? I don't know the what the physics are, but the video is pretty clear and I don't see any way of faking that, which is probably why Mythbusters is going to put it to the test."