The Strange saga of the AR-15 includes John Wayne

Who was the first person to ever shoot an AR15 that didn't work for the small California company that created it? How did the rifle become the most popular + hated gun in America? Pre-order American Gun: The True Story of the AR-15: https://amazon.com/American-Gun-True-Story-AR-15/dp/0374103852/ref=tmm_hrd_swatch_0?_encoding=UTF8&qid=1684255185&sr=8-4