Well if it is primitive , then they should change it in ARK now Because not being able to put more than 1 attachment is annoying and not being able to use a scope with tranq darts is annoying aswell.
I think in Ark 2 they should all more than 1 attachment for guns , because that is the most annoying thing they have so many attachments but only can have 1.
Im having the same problem with any paid for dlcs but island and the free ones, Which kind of sucks because my friend just bought the season pass and we can't play together. Hopefully they fix this soon