I honestly don't remember when the last non-adept weapon mod was added, but I feel like there's so much more that could be done with them.
I'd love to see some more weapon mods that interact with weapon perks or new ones that interact with element key words. Rampage spec, dragonfly spec, and surrounded spec need company or they should become more generalized (for example, rampage spec gets a name change and revamp to slightly increas the duration of all damage dealing perks)
I'd also like to see Stat-tradeoff mods be introduced as regular weapon mods just for that further custom tuning
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Last new actual useful mod we got was adept big ones, not even adept small ones to include red bars and orange bars as a use for primary adept weapons