I got to the 6th step of the magnum opus quest (after getting the relic for banchee) and when I tried to claim the weapon from him it just went to the shop screen. 1) I don't have my inventory full. 2) I have tried deleting the object to reclaim from xur (just the key?) but it doesn't re-unlock or re-aquire the object. 3) I have reset the game and my PC to try to fix (if possible) but no success. Any help to get the gun will be good.