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I have been toying with this particular thought and something has come to mind. Generally full power loads for the AR in 5.56 are considered to be a little hot in milsurp ammo, and full pressure commercial ammo on the shelf is safe to fire in any AR chambered for it. Therefore, why would one gun that uses the same loads be less safe than the other if both are in good repair? Overloading the ammo would be indicated as the only variable that would cause a problem if the ammunition is correctly loaded, as it should be able to function in ANY correctly chambered weapon that is in good repair!