As the M134 is a heavier weapon, and MUST be fired from a decent mount (usually a vehicle of some type), it's no suprise that more rounds than otherwise expected hit the target.
Also, the rapid rate of fire is obviously going to have an impact with more rounds leaving the weapon before recoil becomes a factor.
Actual accuracy of the individual barrels with single shots on the other hand is something else entirely.
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If it moves, shoot it, if not push it, if it still doesn't move, use explosives.
Nothing happens in isolation - it's called "the butterfly effect"
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