My thump got cut& bled by sharp edge of a gun magazine at shootingrange.the magazine was shared w others.not sure if the magazine cut anyone else before; i did not recall seeing blood on it.if someone was cut right before me, risk of getting hiv?

Many things possible: This question comes up from time to time. A person wants to know if he can catch HIV after being cut by a random object (not a used needle). Many things are possible in life. However, in real life, it just doesn't happen (the risk is too tiny). In the US, we don't worry about events like that, even though they are theoretically possible. As they say, "Don't sweat the small stuff."