1. I would say in addition to the reasons listed in the article the MC has a higher tradition of marksmanship than the Army. With the better accuracy and longer effective range of a 20″ barrel compared to a 14.5″ barrel the full size rifle is a better fit for the Marines.

  2. They like the added muzzle velocity of the longer barrel. They don’t like how big it is when they clear a room. They really wish they could adjust the LOP like the Army can with the M4.

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