Remove Weapons From Inventory Option

Rafis12

Some timed weapons have the option to be sold back for 0 GP with "RESELL" option to clear up inventory. How can I do the same for some of the weapons that I won from Zombie mode, or the weapons that I won from crates. I understand that some people enjoy collecting weapons, but collecting the same weapon multiple times does not bring me joy, but dissatisfaction. Now I have to scroll through garbage in my inventory just to find what I am looking for. I only need ONE M4 Laser, but the Void Rift is now forcing a new permanent weapon that I don't want upon me. I would like to play Titan citadel on Nightmare every once in a while but now I don't to avoid getting another perm weapon. What am I missing? Is there a trick to remove weapons from inventory?