Green Eyes & Black Rifles
Order this book as a full-spectrum guide to practical skill development with the AR/M16/M4 platform.
Combine it with this field manual and these two videos.
Add one of these AR15 .22LR conversion kits and two of these full-size .22LR mags.
Finally, take one case of acceptable for practice 5.56x45 and 1000 rounds of Winchester whitebox .22LR to the range.
Work on deliberate aimed fire at full distance (out to 300 yards or further), as well as reactive practical shooting at "city block and under" distances.
You'll be glad you did.