Watch: How to Judge Distance in Real-Life with John “Shrek” McPhee
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"The Sheriff of Baghdad" aka John "Shrek" McPhee of SOB Tactical offers some practical advice on how to estimate distance. This rule of thumb lets you quickly gauge how far away people are from you. https://youtu.be/ODgYcy7M6_0 I checked this
Shoot Like a Soldier: The Army Rifle and Carbine Manual
Army Training Circular, TC 3-22.9 Rifles and Carbines is chock full of military vitamins and useful information on the M-4 Carbines, written for an 18 year old with a GED so it is simply written with pictures suitable for coloring.