My 4.5 was laser, it was actually a high 4.5, 4.56 to be exact. I was just as surprised as you when I got it. The only other person in the combine ran a 4.48 but ran a 10.86 100m, he was 21, I was 18 at the time, which is more in line with what you are saying.
I was more of a track athlete then...