I agree with Iraqgunz, there's no sense in doing the 13.7" barrel/KX3 combo when a 14.5"/Vortex (or similar) set-up will yield an upper with the same barrel length and less weight. I lived in MI and would never have bought the 13.7" for the above reason, in addition to not wanting to lose the muzzle velocity of the round.

I live in an SBR-friendly state now so I accept the trade-off of velocity for compactness. But in MI, you gain nothing (other than weight) with the suggested 13.7" configuration.

But then again, I'm more of a function over form kind of person so "it would look cool" isn't a valid reason for me. Function IS cool.