This happened during my most recent playthrough on the MCC. Had a plasma rifle and a energy sword during the mission Covenant, but when that ended and Cortana began, both of my weapon slots were occupied by Plasma Rifles. There was another on the ground nearby, so I picked it up to have Three Plasma rifles.
![](https://s2.save4k.ru/pic/k7IMfeY8hHI/mqdefault.jpg)