M416 with 4x scope canted sight, ar comp or suppressor, vert grip, extnd/quickdraw and tacstock.
I've started too run just the one weapon so I can carry more ammo and meds instead of having either 2 guns sharing ammo or carrying around 2 types. Most fights happen mid range too close the m4 with this loadout does the job for me at least. I also have a scorpion with a full extended clip just in cased need too switch out from the m4.
Some kind of DMR, preferably a Mini14, SKS, or Mk14 suppressed with extended QuickDraw mag and a light grip on the ones that can take it with a 6x or 8x. Then a shotgun, preferably S12K suppressed extended QuickDraw mag with a red dot. Skorpion for a pistol with a suppressor, light grip, extended mag, red dot, and micro stock. If not a skorpion, a P18C. I carry 1-3 drags and a smoke just in case. Works well for any range. Kinda hard to get though