Keep elbow and wrist locked. From a natural posture take one natural step forward and flex your knees to assume a balance crouch. It is a good idea to alternate practice with both feet. It should be practiced all three ways, and, ideally, will be a step that allows you to move slightly from where you were, thus exiting the kill zone. Gun hand should extend 45 degrees down.
Free hand extends out to side for balance.
Place gun firmly in web of hand, aligned with forearm. Assume instinctive crouch. Grip gun convulsively. Keep gun arm elbow pressed to rib cage. Both eyes open and focused on target.