I thought there were supposed to be stackable attachments (IE: red dot and ACOG)? or was that only in Campaign? Because bieng able to have a half a dozen attachments on an assault rifle would be pretty awesome. Red dot, silencer, grenade launcher, and foregrip all in one. And no secondary attachments? so you wouldnt put a silencer on an M9 or a sight on your G-18? maybe im reading it wrong.