Complex sentence: The maximum range of this weapon (specifically the M107 variant) is 7,450 yards (6,812m), which is the distance quoted in the owner's manual that should be allowed downrange for bullet travel.
Split into simpler sentences: The maximum range of this weapon (specifically the M107 variant) is 7,450 yards (6,812m). This is, in fact, the distance as quoted in the owner's manual that should be allowed downrange for bullet travel.