I have a Surefire MB556-sb on a MK18, it does rattle the fillings in your teeth, if you are going to mount a suppressor go with which ever fits your flavor of can, if your not going to mount a can then Im with the majority, BattleComp cant be beat..However if you were looking into an AAC can I think there maybe something from the creative minds at BCE that will mount AAC cans not sure which models but I have seen some pictures floating around

