I think the only way is to "disassemble" them. Supposedly in the full game you can use the "weapon parts" to upgrade.
English
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They are for upgrades; If you inspect some of the level 20 guns around the vendors in the tower, you will see that they require not only glimmer for upgrades, but also other items.
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Yeah I've seen I've gained weapon parts, didn't know what to do with them.
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Yeah I don't think they released a way to use them until the full game