It would be nice if the tower had a shooting range of sorts. I come by so many different legendary weapons and have to take them to the field to choose the one I want only to get another one right away. I would enjoy being able to fire a couple shots off at the tower in a designated area. Another perk of this is that youd be able to test your heavy weapons and secondary without needing to search for ammo every few kills.
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I agree, simple mechanic and would make the tower more useful than engrams and the floor is lava