PMC's are not a military organization therefore can wear whatever they prefer, especially if they are caught up in combat situations. As in i would much prefer to wear rip-stop camo pants and camo shirts with ripstop fabric, balistic helmets, etc rather than polo shirts, cargo pants and oper8or caps.
Also PMC's have had a history of being in combat whether they were ambushed while baby sitting a vip or while conducting security for a section in Iraq, maybe these guys are training or something.
International law strictly forbids them from wearing anything resembling a military uniform and even pieces of clothing or equipment in an easily recognizable military pattern is in a gray zone. I would know, I know and train with a few guys that work for PMCs.
Critique: well-composed, well done. Three MINOR details for the next projet: 1) Dude in foreground has an AOG and the front blade sight... AS FAR AS I KNOW one does not use an AOG sight with the front sight, rather, a fold-away is used ((Someone in the modern military orret me if I am wrong!)) 2) The guy in the foreground looks like he doesn't have his rifle tuked in tight. Maybe he's getting ready to join his battle-buddy? 3) Did you forget to add the foregrip he seems to be holding? Or is it a stubby?
I have a friend a marine officer and stated that yes you would take off the front sight and use a barrel that has the gas block , unless the AOG sight uses the sight or is sighted to the AOG sight. Even so most times Marines like to keep the sight. Most of the time its the troopers perspective to the gun. So in all the front sight is still on the rifle in the field.