Impact 737r & New NBK?

Looks like there is some metal taken out to make it lighter.

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Does anyone know the difference between these two actions? The only thing I can SEE is a split rail and different bolt knob…. Is that it or am I missing something more?
Besides the obvious split and skeletonized rail I would assume to get the roughly 9.5oz weight reduction they are also using the aluminum bolt knob and shroud that they have. The knob alone is something like 3oz less than the standard knob.