When you aim the gun you do not use your lead hand to point the barrel of the gun around unless you need some really fast cover fire laid down in a different direction. When you turn to shoot and aim or when you come out from behind a bunker to snapshoot your body should turn or flex at the hips to do most of your aiming. The gun should stay stationary in relevance to your entire upper body. This improves aim drastically because your head and gun never waiver in relation to each other so your aim will stay consistent.