Project Appleseed

Dry firing will reinforce muscle memory, position acquisition, and is a good way to run through "the six steps of firing a shot." 
Get/make suitable black dots to aim at for dry fire drills.
Here's one more dry fire benefit: grip hold and trigger pull analysis- or the motion imparted to the rifle as a consequence of how you hold the grip and squeeze the trigger.  Depending where the trigger is located relative to the centerline of the rifle, pulling backward on the grip can cause considerable vertical rotation of the rifle.  AR is particularly susceptible to vertical motion due to the location of the grip far below centerline- pull the grip back, cause the muzzle to dip.  Similarly, you'll notice the rifle move off target if you pull the trigger any way but straight back.  I had a tendency to rotate the rifle leftward as I squeezed.  M1 on the other hand 'likes' being pulled against the shoulder & moves far less of target than the AR. 
Want to really put the way you squeeze the trigger under the microscope?  Set up as normally, but put the safety on. You'll see which trigger techniques cause unwanted rifle displacement, and which don't as you really load that trigger.  Putting the safety on will smoke out even a subtle motion which you might not have otherwise noticed.  Squeeze and watch the influence on the sight picture. 

Dry fire targets attached.