My dad lost his arm from just below the elbow down in an accident 10 years ago. To make matters worse it was with his strong arm. He has since relearned to do everything with his weak hand and gotten almost as good with it as he was with his strong hand. Anyway, I have seen him rack several different guns with just one hand and he will do it with whatever he has at his disposal at the time. I have seen him do it on his pants leg, across his chest wearing blue jean overalls, boots, on chairs, trees, fence post, etc... You'd be surprised how a person can learn to adapt when you have to. Then there were sometimes he didn't want to mess with it and just hand me the gun to charge for him. I don't condone or condemn anybody choice of carry condition, I am just saying I have witnessed what a man with one hand can do as far as racking a slide goes. Of course my Dad did all this at his own pace and was not under stress or threat of bodily injury or death.