You are not paying attention. Hand cannons are mechanically operated like they are today. Look at them and their features. There is a bullet, a barrel and a hammer on hand cannons aswell as todays guns. Physics dosnt change in the future, nor does common sence ( in the way that there is no reason not to align them even if spacemagic) To dumb it down for you. It would be like turning the gun towards you but the bullets goibg out of the gun from the back of it and towards the enemy. No space magic makes that ok