I read in the fandom that the CSG should be able to shoot normal speargun arrows. However when attempting to do so on my first NG save, it wouldn’t even aim, had to build the regular gun. Not that it really matters, but would be fun to use the more sleek design. Hope to see this fixed whenever possible 
Hi vilecrow, thank you for reporting this,
This is considered “as designed” by the team, however I will pass your feedback onto the team for their consideration.
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