Joe Carlos discusses some issues important when building a match grade AR-15 for use in High Power or Across The Course Competition as used in NRA and CMP events.
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American Gunsmith 
You mentioned 2 ways to stabilize the barrel to gain more accuracy. I propose a 3rd and would like to know your thoughts. Bravo Company upper receivers have the inside diameter of the barrel nut machined slightly undersized for a more snug fit. Do you think this is an improvement?