They don't care about getting things right or attention to detail I brought up this same issue during the closed beta, as well as many other silly mistakes on firearms. It's a QD AAC break (that they called a compensator on the AR's) and for some reason doesn't accept the AAC suppressor it's made for (that's the main one in the game) on top of having the ports facing the wrong directions. How the ports are currently set up would cause significant muzzle flash directly obstructing ones sight picture in low light-night as well as kick up an absurd amount of debris while shooting from a nealing or prone position they should face to the 3 & 9 o'clock, not the 6 & 12 o'clock it's a stupid mistake to have made and is a pretty embarrassing oversight for anyone with access to the internet to have made let alone a well paid a designer at AAA studio who's job it is to model firearms.