How can I get Weapon Shards?

You can get 150 weapon shards by recycling 4-star weapons or above. You'll get the shards of the same quality (4-star weapons will produce 4-star weapon shards) Fortunately, this also includes Weapon Enhancers (fodder for leveling up weapons). You can use these shards at the Recycle Shop for cogs, memory enhancers, and weapons. Early in the game, you can recycle these purple weapon enhancers so you can get decent 4-star weapons as your placeholders until you get better ones.