I wouldn't suggest this gun for a new RNG - it requires some particular gear to get a 5-hit and unlock its full potential. Unless you're a THF with Skadi's Chausses, you're probably better off using an E/Vbow.
That said, the gun attacks twice on normal ranged attacks about 40-45% of the time, it doesn't attack twice on WS or Barrage. WS's are still respectable but wouldn't compare with Hellfire+1 or Annihilator - the difference is in the frequency of WS's.
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