The m16s and CAR15s with grenade launchers can’t equip scopes or silencers. I figured this may be kind of balance issue but in case it isn’t I wanted to report it. I also would hope if it WERE a balance thing that you would forego with that decision because (unless there’s some type of historical context to this decision I’m unaware of) I think it’s more realistic to just allow attachments on the weapon .