Re: Mark 4 or NF (Need Help)
I use both also.
But just opposite the others, I prefer Mk4s over NXS.
Mk4s are lighter, mount lower, can be customized through Leupold's custom shop(ordered through PlanetOptics), and the Alumina flip-ups combined with a non-eyepiece-turning zoom is very improved over Butlers on an NXS.
The glass quality is exactly the same between them.
All other features seem equal.
So as far as performance, it really comes down to reticle & weight.