I've personally seen two 700's fire when taking the safety off. Two different rifles both new and made within the last 3 years. Not bashing on Remington just saying I've seen this happen first hand. What is the % that you will get one that has something wrong with it? Not a clue. It has to be very very minimal because if not there would be a total recall on all of them. And it's amazing to me that I have witnessed two occasions within the last 3 years. So I wouldn't worry about it just put the rifle through some tests when you get it, if it don't do it then it probably never will.