Originally Posted by
dirtyklingon
bits = cash shop currency - bought with irl dollars and pesos
scrip = vendor/trade currency - obtained from quests and loot drops
salvage or w/e it is = salvage currency(used for adding mods and mods slots to weapons) - obtained from breaking down weapons and loot drops.
key codes = required for buying lock boxes - obtained from quests and arkfalls.
you can and will get duplicates of weapons, from both gameplay and lockboxes. the lockboxes have normal weapons you can get from looting mobs and such.
you are not meant to hoard items. you can try but you'll quickly run out of inv space.