You must not read the shit in red text at the bottom that says it'll go away. And if you are so limited on the real items in game that do the same exact thing then you should go out and do some patrol missions. I myself have nearly 150-200 of each damn glimmer farm item. And another thing the weapon upgrades are cheap as -blam!- from the gunsmith. you must not play the game very much to even look for like 30 seconds at an npcs inventory.