is this a foul?

[Jurassic Referee]

Originally posted by foobar247

if a defender is putting a hand up to block a shooter's shot, and as the shooter moves his hands forward to shoot, and makes contact with the defender's arm, is that a foul?

You said "is putting". If the defender's hands are still in motion on the way up when the contact occurs, the foul is usually on the defender. If the defender gets his hands straight up within the frame of his body before the contact occurs, it's not a foul on the defender.