Comment The other question that needs to be asked (Score 2) 600
Was that 99.99% test done on a fire arm that has been used much? I kind of remember one of the big problems with these kinds of devices is that if you practiced regularly with the gun the shock from all those firings tended to break this kind of hardware. (And yes, you're supposed to practice with the actual gun you're going to use to protect yourself with. Picking up a random gun and getting off a perfect only happens in the movies.)