Remembering Newton and his decision to make every action have an equal and opposite reaction, I've long puzzled over recoil. Now, hitting a target with SAA will deliver enough kinetic energy to knock a man over. So, plenty of KE being delivered at point of impact. Now, the round cannot deliver more energy than that imparted to it, which is done when the round is fired. Which makes me wonder - how on earth can the energy at impact be sufficient to knock a bloke over, yet the equal and opposite reaction to the round being fired will do no such thing, assuming weapon held correctly?