Here's another gun upload featuring the Mk.46 MOD 0 used by Martin Henning of the Norwegian FSK/HJK.
The Mk.46 is basically a lightweight M249 SAW developed for the US Navy's Special Warfare Command, hence the "Mark" (Mk.) designation, it fires the smaller 5.56 NATO cartride compared to it's bigger brother; the Mk.48 MOD 0.
Henning's Mk.46 is equipped with an Elcan SpectreDR 1-4x a low power dual purpose optic. A vertical fore grip helps him move the gun around and it has an AN/PEQ-16 which can project a visible aiming laser or one that can only be seen when using a night vision device. And he also uses orange tracer rounds
For unique mods, his trigger's sensitivity has been increased to speed up the rate of follow-up shots and the gas pressure has been reduced to lower than normal making the weapon under-gassed and making it's rate of fire slower thus making the gun more stable. And he also had the bipod removed to make it lighter.