[Head416]

Dry fire. If the barrel dips down, that's your flinch in action. Have your buddy load an unknown number of rounds in a mag and watch what happens when you try to pull the trigger on an empty chamber. Practice with a .22 is also good, along with dry fire practice at home.

Brain farts with dry fire kill people, so be careful, clear the gun, then clear it again. Keep ammo in a separate room before starting dry fire practice, then clear the gun again before starting. And aim at something that can take a bullet without anybody getting hurt. If the phone rings, somebody talks to you, you leave the room, any interruption at all, clear the gun again. You don't want an article in the paper about how you "thought the gun was unloaded."