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Really that much of a difference over the gen 4? I can shoot nearly as well with the glock as the shadow 1 both stock. It's a pretty easy printable pistol. The finger grooves fit me pretty well. Though I can see the gen 5 being a bit more universal.
Really boils down to the changes that they have made to the barrel, different lock up system for most and a change to the rifling - as far as I can recall.